20809971

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{25409}}^1$

素因数の和:25435

約数の個数: 24

約数和(自身を含む): 36996960

約数和(自身を除く): 16186989

約数列:

[1, 3, 7, 9, 13, 21, 39, 63, 91, 117, 273, 819, 25409, 76227, 177863, 228681, 330317, 533589, 990951, 1600767, 2312219, 2972853, 6936657, 20809971]

約数ペア:

[(1, 20809971), (3, 6936657), (7, 2972853), (9, 2312219), (13, 1600767), (21, 990951), (39, 533589), (63, 330317), (91, 228681), (117, 177863), (273, 76227), (819, 25409)]