21979440

素因数分解:

$2^4\times 3^2\times 5^1\times 7^3\times {\mathrm{89}}^1$

素因数の和:129

約数の個数: 240

約数和(自身を含む): 87048000

約数和(自身を除く): 65068560

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 24, 28, 30, 35, 36, 40, 42, 45, 48, 49, 56, 60, 63, 70, 72, 80, 84, 89, 90, 98, 105, 112, 120, 126, 140, 144, 147, 168, 178, 180, 196, 210, 240, 245, 252, 267, 280, 294, 315, 336, 343, 356, 360, 392, 420, 441, 445, 490, 504, 534, 560, 588, 623, 630, 686, 712, 720, 735, 784, 801, 840, 882, 890, 980, 1008, 1029, 1068, 1176, 1246, 1260, 1335, 1372, 1424, 1470, 1602, 1680, 1715, 1764, 1780, 1869, 1960, 2058, 2136, 2205, 2352, 2492, 2520, 2670, 2744, 2940, 3087, 3115, 3204, 3430, 3528, 3560, 3738, 3920, 4005, 4116, 4272, 4361, 4410, 4984, 5040, 5145, 5340, 5488, 5607, 5880, 6174, 6230, 6408, 6860, 7056, 7120, 7476, 8010, 8232, 8722, 8820, 9345, 9968, 10290, 10680, 11214, 11760, 12348, 12460, 12816, 13083, 13720, 14952, 15435, 16020, 16464, 17444, 17640, 18690, 20580, 21360, 21805, 22428, 24696, 24920, 26166, 27440, 28035, 29904, 30527, 30870, 32040, 34888, 35280, 37380, 39249, 41160, 43610, 44856, 49392, 49840, 52332, 56070, 61054, 61740, 64080, 65415, 69776, 74760, 78498, 82320, 87220, 89712, 91581, 104664, 112140, 122108, 123480, 130830, 149520, 152635, 156996, 174440, 183162, 196245, 209328, 224280, 244216, 246960, 261660, 274743, 305270, 313992, 348880, 366324, 392490, 448560, 457905, 488432, 523320, 549486, 610540, 627984, 732648, 784980, 915810, 1046640, 1098972, 1221080, 1373715, 1465296, 1569960, 1831620, 2197944, 2442160, 2747430, 3139920, 3663240, 4395888, 5494860, 7326480, 10989720, 21979440]

約数ペア:

[(1, 21979440), (2, 10989720), (3, 7326480), (4, 5494860), (5, 4395888), (6, 3663240), (7, 3139920), (8, 2747430), (9, 2442160), (10, 2197944), (12, 1831620), (14, 1569960), (15, 1465296), (16, 1373715), (18, 1221080), (20, 1098972), (21, 1046640), (24, 915810), (28, 784980), (30, 732648), (35, 627984), (36, 610540), (40, 549486), (42, 523320), (45, 488432), (48, 457905), (49, 448560), (56, 392490), (60, 366324), (63, 348880), (70, 313992), (72, 305270), (80, 274743), (84, 261660), (89, 246960), (90, 244216), (98, 224280), (105, 209328), (112, 196245), (120, 183162), (126, 174440), (140, 156996), (144, 152635), (147, 149520), (168, 130830), (178, 123480), (180, 122108), (196, 112140), (210, 104664), (240, 91581), (245, 89712), (252, 87220), (267, 82320), (280, 78498), (294, 74760), (315, 69776), (336, 65415), (343, 64080), (356, 61740), (360, 61054), (392, 56070), (420, 52332), (441, 49840), (445, 49392), (490, 44856), (504, 43610), (534, 41160), (560, 39249), (588, 37380), (623, 35280), (630, 34888), (686, 32040), (712, 30870), (720, 30527), (735, 29904), (784, 28035), (801, 27440), (840, 26166), (882, 24920), (890, 24696), (980, 22428), (1008, 21805), (1029, 21360), (1068, 20580), (1176, 18690), (1246, 17640), (1260, 17444), (1335, 16464), (1372, 16020), (1424, 15435), (1470, 14952), (1602, 13720), (1680, 13083), (1715, 12816), (1764, 12460), (1780, 12348), (1869, 11760), (1960, 11214), (2058, 10680), (2136, 10290), (2205, 9968), (2352, 9345), (2492, 8820), (2520, 8722), (2670, 8232), (2744, 8010), (2940, 7476), (3087, 7120), (3115, 7056), (3204, 6860), (3430, 6408), (3528, 6230), (3560, 6174), (3738, 5880), (3920, 5607), (4005, 5488), (4116, 5340), (4272, 5145), (4361, 5040), (4410, 4984)]