19906985

素因数分解:

$5^1\times 7^2\times {\mathrm{193}}^1\times {\mathrm{421}}^1$

素因数の和:633

約数の個数: 24

約数和(自身を含む): 27998856

約数和(自身を除く): 8091871

約数列:

[1, 5, 7, 35, 49, 193, 245, 421, 965, 1351, 2105, 2947, 6755, 9457, 14735, 20629, 47285, 81253, 103145, 406265, 568771, 2843855, 3981397, 19906985]

約数ペア:

[(1, 19906985), (5, 3981397), (7, 2843855), (35, 568771), (49, 406265), (193, 103145), (245, 81253), (421, 47285), (965, 20629), (1351, 14735), (2105, 9457), (2947, 6755)]