20638540

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{79379}}^1$

素因数の和:79401

約数の個数: 24

約数和(自身を含む): 46675440

約数和(自身を除く): 26036900

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 79379, 158758, 317516, 396895, 793790, 1031927, 1587580, 2063854, 4127708, 5159635, 10319270, 20638540]

約数ペア:

[(1, 20638540), (2, 10319270), (4, 5159635), (5, 4127708), (10, 2063854), (13, 1587580), (20, 1031927), (26, 793790), (52, 396895), (65, 317516), (130, 158758), (260, 79379)]