28387775

素因数分解:

$5^2\times {\mathrm{13}}^2\times {\mathrm{6719}}^1$

素因数の和:6755

約数の個数: 18

約数和(自身を含む): 38122560

約数和(自身を除く): 9734785

約数列:

[1, 5, 13, 25, 65, 169, 325, 845, 4225, 6719, 33595, 87347, 167975, 436735, 1135511, 2183675, 5677555, 28387775]

約数ペア:

[(1, 28387775), (5, 5677555), (13, 2183675), (25, 1135511), (65, 436735), (169, 167975), (325, 87347), (845, 33595), (4225, 6719)]