28218775

素因数分解:

$5^2\times {\mathrm{13}}^2\times {\mathrm{6679}}^1$

素因数の和:6715

約数の個数: 18

約数和(自身を含む): 37895640

約数和(自身を除く): 9676865

約数列:

[1, 5, 13, 25, 65, 169, 325, 845, 4225, 6679, 33395, 86827, 166975, 434135, 1128751, 2170675, 5643755, 28218775]

約数ペア:

[(1, 28218775), (5, 5643755), (13, 2170675), (25, 1128751), (65, 434135), (169, 166975), (325, 86827), (845, 33395), (4225, 6679)]