20643025

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{3343}}^1$

素因数の和:3385

約数の個数: 24

約数和(自身を含む): 29025920

約数和(自身を除く): 8382895

約数列:

[1, 5, 13, 19, 25, 65, 95, 247, 325, 475, 1235, 3343, 6175, 16715, 43459, 63517, 83575, 217295, 317585, 825721, 1086475, 1587925, 4128605, 20643025]

約数ペア:

[(1, 20643025), (5, 4128605), (13, 1587925), (19, 1086475), (25, 825721), (65, 317585), (95, 217295), (247, 83575), (325, 63517), (475, 43459), (1235, 16715), (3343, 6175)]