21386655

素因数分解:

$3^2\times 5^1\times {\mathrm{661}}^1\times {\mathrm{719}}^1$

素因数の和:1391

約数の個数: 24

約数和(自身を含む): 37177920

約数和(自身を除く): 15791265

約数列:

[1, 3, 5, 9, 15, 45, 661, 719, 1983, 2157, 3305, 3595, 5949, 6471, 9915, 10785, 29745, 32355, 475259, 1425777, 2376295, 4277331, 7128885, 21386655]

約数ペア:

[(1, 21386655), (3, 7128885), (5, 4277331), (9, 2376295), (15, 1425777), (45, 475259), (661, 32355), (719, 29745), (1983, 10785), (2157, 9915), (3305, 6471), (3595, 5949)]