21563555

素因数分解:

$5^1\times {\mathrm{13}}^4\times {\mathrm{151}}^1$

素因数の和:208

約数の個数: 20

約数和(自身を含む): 28218192

約数和(自身を除く): 6654637

約数列:

[1, 5, 13, 65, 151, 169, 755, 845, 1963, 2197, 9815, 10985, 25519, 28561, 127595, 142805, 331747, 1658735, 4312711, 21563555]

約数ペア:

[(1, 21563555), (5, 4312711), (13, 1658735), (65, 331747), (151, 142805), (169, 127595), (755, 28561), (845, 25519), (1963, 10985), (2197, 9815)]