21015280

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^2\times {\mathrm{13}}^1\times {\mathrm{167}}^1$

素因数の和:215

約数の個数: 120

約数和(自身を含む): 58183776

約数和(自身を除く): 37168496

約数列:

[1, 2, 4, 5, 8, 10, 11, 13, 16, 20, 22, 26, 40, 44, 52, 55, 65, 80, 88, 104, 110, 121, 130, 143, 167, 176, 208, 220, 242, 260, 286, 334, 440, 484, 520, 572, 605, 668, 715, 835, 880, 968, 1040, 1144, 1210, 1336, 1430, 1573, 1670, 1837, 1936, 2171, 2288, 2420, 2672, 2860, 3146, 3340, 3674, 4342, 4840, 5720, 6292, 6680, 7348, 7865, 8684, 9185, 9680, 10855, 11440, 12584, 13360, 14696, 15730, 17368, 18370, 20207, 21710, 23881, 25168, 29392, 31460, 34736, 36740, 40414, 43420, 47762, 62920, 73480, 80828, 86840, 95524, 101035, 119405, 125840, 146960, 161656, 173680, 191048, 202070, 238810, 262691, 323312, 382096, 404140, 477620, 525382, 808280, 955240, 1050764, 1313455, 1616560, 1910480, 2101528, 2626910, 4203056, 5253820, 10507640, 21015280]

約数ペア:

[(1, 21015280), (2, 10507640), (4, 5253820), (5, 4203056), (8, 2626910), (10, 2101528), (11, 1910480), (13, 1616560), (16, 1313455), (20, 1050764), (22, 955240), (26, 808280), (40, 525382), (44, 477620), (52, 404140), (55, 382096), (65, 323312), (80, 262691), (88, 238810), (104, 202070), (110, 191048), (121, 173680), (130, 161656), (143, 146960), (167, 125840), (176, 119405), (208, 101035), (220, 95524), (242, 86840), (260, 80828), (286, 73480), (334, 62920), (440, 47762), (484, 43420), (520, 40414), (572, 36740), (605, 34736), (668, 31460), (715, 29392), (835, 25168), (880, 23881), (968, 21710), (1040, 20207), (1144, 18370), (1210, 17368), (1336, 15730), (1430, 14696), (1573, 13360), (1670, 12584), (1837, 11440), (1936, 10855), (2171, 9680), (2288, 9185), (2420, 8684), (2672, 7865), (2860, 7348), (3146, 6680), (3340, 6292), (3674, 5720), (4342, 4840)]