20487875

素因数分解:

$5^3\times {\mathrm{251}}^1\times {\mathrm{653}}^1$

素因数の和:919

約数の個数: 16

約数和(自身を含む): 25710048

約数和(自身を除く): 5222173

約数列:

[1, 5, 25, 125, 251, 653, 1255, 3265, 6275, 16325, 31375, 81625, 163903, 819515, 4097575, 20487875]

約数ペア:

[(1, 20487875), (5, 4097575), (25, 819515), (125, 163903), (251, 81625), (653, 31375), (1255, 16325), (3265, 6275)]