20999685

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{28571}}^1$

素因数の和:28593

約数の個数: 24

約数和(自身を含む): 39086496

約数和(自身を除く): 18086811

約数列:

[1, 3, 5, 7, 15, 21, 35, 49, 105, 147, 245, 735, 28571, 85713, 142855, 199997, 428565, 599991, 999985, 1399979, 2999955, 4199937, 6999895, 20999685]

約数ペア:

[(1, 20999685), (3, 6999895), (5, 4199937), (7, 2999955), (15, 1399979), (21, 999985), (35, 599991), (49, 428565), (105, 199997), (147, 142855), (245, 85713), (735, 28571)]