21193815

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^2\times {\mathrm{4889}}^1$

素因数の和:4931

約数の個数: 24

約数和(自身を含む): 36029520

約数和(自身を除く): 14835705

約数列:

[1, 3, 5, 15, 17, 51, 85, 255, 289, 867, 1445, 4335, 4889, 14667, 24445, 73335, 83113, 249339, 415565, 1246695, 1412921, 4238763, 7064605, 21193815]

約数ペア:

[(1, 21193815), (3, 7064605), (5, 4238763), (15, 1412921), (17, 1246695), (51, 415565), (85, 249339), (255, 83113), (289, 73335), (867, 24445), (1445, 14667), (4335, 4889)]