21128565

素因数分解:

$3^1\times 5^1\times {\mathrm{907}}^1\times {\mathrm{1553}}^1$

素因数の和:2468

約数の個数: 16

約数和(自身を含む): 33864768

約数和(自身を除く): 12736203

約数列:

[1, 3, 5, 15, 907, 1553, 2721, 4535, 4659, 7765, 13605, 23295, 1408571, 4225713, 7042855, 21128565]

約数ペア:

[(1, 21128565), (3, 7042855), (5, 4225713), (15, 1408571), (907, 23295), (1553, 13605), (2721, 7765), (4535, 4659)]