21107320

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{40591}}^1$

素因数の和:40615

約数の個数: 32

約数和(自身を含む): 51145920

約数和(自身を除く): 30038600

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 40591, 81182, 162364, 202955, 324728, 405910, 527683, 811820, 1055366, 1623640, 2110732, 2638415, 4221464, 5276830, 10553660, 21107320]

約数ペア:

[(1, 21107320), (2, 10553660), (4, 5276830), (5, 4221464), (8, 2638415), (10, 2110732), (13, 1623640), (20, 1055366), (26, 811820), (40, 527683), (52, 405910), (65, 324728), (104, 202955), (130, 162364), (260, 81182), (520, 40591)]