21247915

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{2999}}^1$

素因数の和:3126

約数の個数: 16

約数和(自身を含む): 27720000

約数和(自身を除く): 6472085

約数列:

[1, 5, 13, 65, 109, 545, 1417, 2999, 7085, 14995, 38987, 194935, 326891, 1634455, 4249583, 21247915]

約数ペア:

[(1, 21247915), (5, 4249583), (13, 1634455), (65, 326891), (109, 194935), (545, 38987), (1417, 14995), (2999, 7085)]