21209240

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{40787}}^1$

素因数の和:40811

約数の個数: 32

約数和(自身を含む): 51392880

約数和(自身を除く): 30183640

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 40787, 81574, 163148, 203935, 326296, 407870, 530231, 815740, 1060462, 1631480, 2120924, 2651155, 4241848, 5302310, 10604620, 21209240]

約数ペア:

[(1, 21209240), (2, 10604620), (4, 5302310), (5, 4241848), (8, 2651155), (10, 2120924), (13, 1631480), (20, 1060462), (26, 815740), (40, 530231), (52, 407870), (65, 326296), (104, 203935), (130, 163148), (260, 81574), (520, 40787)]