19978825

素因数分解:

$5^2\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{1621}}^1$

素因数の和:1677

約数の個数: 24

約数和(自身を含む): 27152280

約数和(自身を除く): 7173455

約数列:

[1, 5, 17, 25, 29, 85, 145, 425, 493, 725, 1621, 2465, 8105, 12325, 27557, 40525, 47009, 137785, 235045, 688925, 799153, 1175225, 3995765, 19978825]

約数ペア:

[(1, 19978825), (5, 3995765), (17, 1175225), (25, 799153), (29, 688925), (85, 235045), (145, 137785), (425, 47009), (493, 40525), (725, 27557), (1621, 12325), (2465, 8105)]