19997575

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{1663}}^1$

素因数の和:1723

約数の個数: 24

約数和(自身を含む): 27442688

約数和(自身を除く): 7445113

約数列:

[1, 5, 13, 25, 37, 65, 185, 325, 481, 925, 1663, 2405, 8315, 12025, 21619, 41575, 61531, 108095, 307655, 540475, 799903, 1538275, 3999515, 19997575]

約数ペア:

[(1, 19997575), (5, 3999515), (13, 1538275), (25, 799903), (37, 540475), (65, 307655), (185, 108095), (325, 61531), (481, 41575), (925, 21619), (1663, 12025), (2405, 8315)]