21016840

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^2\times {\mathrm{3109}}^1$

素因数の和:3146

約数の個数: 48

約数和(自身を含む): 51221700

約数和(自身を除く): 30204860

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 169, 260, 338, 520, 676, 845, 1352, 1690, 3109, 3380, 6218, 6760, 12436, 15545, 24872, 31090, 40417, 62180, 80834, 124360, 161668, 202085, 323336, 404170, 525421, 808340, 1050842, 1616680, 2101684, 2627105, 4203368, 5254210, 10508420, 21016840]

約数ペア:

[(1, 21016840), (2, 10508420), (4, 5254210), (5, 4203368), (8, 2627105), (10, 2101684), (13, 1616680), (20, 1050842), (26, 808340), (40, 525421), (52, 404170), (65, 323336), (104, 202085), (130, 161668), (169, 124360), (260, 80834), (338, 62180), (520, 40417), (676, 31090), (845, 24872), (1352, 15545), (1690, 12436), (3109, 6760), (3380, 6218)]