21688820

素因数分解:

$2^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{9949}}^1$

素因数の和:10067

約数の個数: 24

約数和(自身を含む): 45969000

約数和(自身を除く): 24280180

約数列:

[1, 2, 4, 5, 10, 20, 109, 218, 436, 545, 1090, 2180, 9949, 19898, 39796, 49745, 99490, 198980, 1084441, 2168882, 4337764, 5422205, 10844410, 21688820]

約数ペア:

[(1, 21688820), (2, 10844410), (4, 5422205), (5, 4337764), (10, 2168882), (20, 1084441), (109, 198980), (218, 99490), (436, 49745), (545, 39796), (1090, 19898), (2180, 9949)]