21247919

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{79}}^1\times {\mathrm{499}}^1$

素因数の和:603

約数の個数: 24

約数和(自身を含む): 27360000

約数和(自身を除く): 6112081

約数列:

[1, 7, 11, 49, 77, 79, 499, 539, 553, 869, 3493, 3871, 5489, 6083, 24451, 38423, 39421, 42581, 268961, 275947, 433631, 1931629, 3035417, 21247919]

約数ペア:

[(1, 21247919), (7, 3035417), (11, 1931629), (49, 433631), (77, 275947), (79, 268961), (499, 42581), (539, 39421), (553, 38423), (869, 24451), (3493, 6083), (3871, 5489)]