21300720

素因数分解:

$2^4\times 3^1\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{409}}^1$

素因数の和:463

約数の個数: 160

約数和(自身を含む): 78090240

約数和(自身を除く): 56789520

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 16, 20, 21, 24, 28, 30, 31, 35, 40, 42, 48, 56, 60, 62, 70, 80, 84, 93, 105, 112, 120, 124, 140, 155, 168, 186, 210, 217, 240, 248, 280, 310, 336, 372, 409, 420, 434, 465, 496, 560, 620, 651, 744, 818, 840, 868, 930, 1085, 1227, 1240, 1302, 1488, 1636, 1680, 1736, 1860, 2045, 2170, 2454, 2480, 2604, 2863, 3255, 3272, 3472, 3720, 4090, 4340, 4908, 5208, 5726, 6135, 6510, 6544, 7440, 8180, 8589, 8680, 9816, 10416, 11452, 12270, 12679, 13020, 14315, 16360, 17178, 17360, 19632, 22904, 24540, 25358, 26040, 28630, 32720, 34356, 38037, 42945, 45808, 49080, 50716, 52080, 57260, 63395, 68712, 76074, 85890, 88753, 98160, 101432, 114520, 126790, 137424, 152148, 171780, 177506, 190185, 202864, 229040, 253580, 266259, 304296, 343560, 355012, 380370, 443765, 507160, 532518, 608592, 687120, 710024, 760740, 887530, 1014320, 1065036, 1331295, 1420048, 1521480, 1775060, 2130072, 2662590, 3042960, 3550120, 4260144, 5325180, 7100240, 10650360, 21300720]

約数ペア:

[(1, 21300720), (2, 10650360), (3, 7100240), (4, 5325180), (5, 4260144), (6, 3550120), (7, 3042960), (8, 2662590), (10, 2130072), (12, 1775060), (14, 1521480), (15, 1420048), (16, 1331295), (20, 1065036), (21, 1014320), (24, 887530), (28, 760740), (30, 710024), (31, 687120), (35, 608592), (40, 532518), (42, 507160), (48, 443765), (56, 380370), (60, 355012), (62, 343560), (70, 304296), (80, 266259), (84, 253580), (93, 229040), (105, 202864), (112, 190185), (120, 177506), (124, 171780), (140, 152148), (155, 137424), (168, 126790), (186, 114520), (210, 101432), (217, 98160), (240, 88753), (248, 85890), (280, 76074), (310, 68712), (336, 63395), (372, 57260), (409, 52080), (420, 50716), (434, 49080), (465, 45808), (496, 42945), (560, 38037), (620, 34356), (651, 32720), (744, 28630), (818, 26040), (840, 25358), (868, 24540), (930, 22904), (1085, 19632), (1227, 17360), (1240, 17178), (1302, 16360), (1488, 14315), (1636, 13020), (1680, 12679), (1736, 12270), (1860, 11452), (2045, 10416), (2170, 9816), (2454, 8680), (2480, 8589), (2604, 8180), (2863, 7440), (3255, 6544), (3272, 6510), (3472, 6135), (3720, 5726), (4090, 5208), (4340, 4908)]