21012680

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{2377}}^1$

素因数の和:2418

約数の個数: 64

約数和(自身を含む): 53933040

約数和(自身を除く): 32920360

約数列:

[1, 2, 4, 5, 8, 10, 13, 17, 20, 26, 34, 40, 52, 65, 68, 85, 104, 130, 136, 170, 221, 260, 340, 442, 520, 680, 884, 1105, 1768, 2210, 2377, 4420, 4754, 8840, 9508, 11885, 19016, 23770, 30901, 40409, 47540, 61802, 80818, 95080, 123604, 154505, 161636, 202045, 247208, 309010, 323272, 404090, 525317, 618020, 808180, 1050634, 1236040, 1616360, 2101268, 2626585, 4202536, 5253170, 10506340, 21012680]

約数ペア:

[(1, 21012680), (2, 10506340), (4, 5253170), (5, 4202536), (8, 2626585), (10, 2101268), (13, 1616360), (17, 1236040), (20, 1050634), (26, 808180), (34, 618020), (40, 525317), (52, 404090), (65, 323272), (68, 309010), (85, 247208), (104, 202045), (130, 161636), (136, 154505), (170, 123604), (221, 95080), (260, 80818), (340, 61802), (442, 47540), (520, 40409), (680, 30901), (884, 23770), (1105, 19016), (1768, 11885), (2210, 9508), (2377, 8840), (4420, 4754)]