21405489

素因数分解:

$3^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{6841}}^1$

素因数の和:7000

約数の個数: 16

約数和(自身を含む): 32841600

約数和(自身を除く): 11436111

約数列:

[1, 3, 7, 21, 149, 447, 1043, 3129, 6841, 20523, 47887, 143661, 1019309, 3057927, 7135163, 21405489]

約数ペア:

[(1, 21405489), (3, 7135163), (7, 3057927), (21, 1019309), (149, 143661), (447, 47887), (1043, 20523), (3129, 6841)]