21379475

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{157}}^1\times {\mathrm{419}}^1$

素因数の和:599

約数の個数: 24

約数和(自身を含む): 28800240

約数和(自身を除く): 7420765

約数列:

[1, 5, 13, 25, 65, 157, 325, 419, 785, 2041, 2095, 3925, 5447, 10205, 10475, 27235, 51025, 65783, 136175, 328915, 855179, 1644575, 4275895, 21379475]

約数ペア:

[(1, 21379475), (5, 4275895), (13, 1644575), (25, 855179), (65, 328915), (157, 136175), (325, 65783), (419, 51025), (785, 27235), (2041, 10475), (2095, 10205), (3925, 5447)]