21201720

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{547}}^1$

素因数の和:597

約数の個数: 128

約数和(自身を含む): 71020800

約数和(自身を除く): 49819080

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 19, 20, 24, 30, 34, 38, 40, 51, 57, 60, 68, 76, 85, 95, 102, 114, 120, 136, 152, 170, 190, 204, 228, 255, 285, 323, 340, 380, 408, 456, 510, 547, 570, 646, 680, 760, 969, 1020, 1094, 1140, 1292, 1615, 1641, 1938, 2040, 2188, 2280, 2584, 2735, 3230, 3282, 3876, 4376, 4845, 5470, 6460, 6564, 7752, 8205, 9299, 9690, 10393, 10940, 12920, 13128, 16410, 18598, 19380, 20786, 21880, 27897, 31179, 32820, 37196, 38760, 41572, 46495, 51965, 55794, 62358, 65640, 74392, 83144, 92990, 103930, 111588, 124716, 139485, 155895, 176681, 185980, 207860, 223176, 249432, 278970, 311790, 353362, 371960, 415720, 530043, 557940, 623580, 706724, 883405, 1060086, 1115880, 1247160, 1413448, 1766810, 2120172, 2650215, 3533620, 4240344, 5300430, 7067240, 10600860, 21201720]

約数ペア:

[(1, 21201720), (2, 10600860), (3, 7067240), (4, 5300430), (5, 4240344), (6, 3533620), (8, 2650215), (10, 2120172), (12, 1766810), (15, 1413448), (17, 1247160), (19, 1115880), (20, 1060086), (24, 883405), (30, 706724), (34, 623580), (38, 557940), (40, 530043), (51, 415720), (57, 371960), (60, 353362), (68, 311790), (76, 278970), (85, 249432), (95, 223176), (102, 207860), (114, 185980), (120, 176681), (136, 155895), (152, 139485), (170, 124716), (190, 111588), (204, 103930), (228, 92990), (255, 83144), (285, 74392), (323, 65640), (340, 62358), (380, 55794), (408, 51965), (456, 46495), (510, 41572), (547, 38760), (570, 37196), (646, 32820), (680, 31179), (760, 27897), (969, 21880), (1020, 20786), (1094, 19380), (1140, 18598), (1292, 16410), (1615, 13128), (1641, 12920), (1938, 10940), (2040, 10393), (2188, 9690), (2280, 9299), (2584, 8205), (2735, 7752), (3230, 6564), (3282, 6460), (3876, 5470), (4376, 4845)]