20989790

素因数分解:

$2^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{67709}}^1$

素因数の和:67747

約数の個数: 16

約数和(自身を含む): 39000960

約数和(自身を除く): 18011170

約数列:

[1, 2, 5, 10, 31, 62, 155, 310, 67709, 135418, 338545, 677090, 2098979, 4197958, 10494895, 20989790]

約数ペア:

[(1, 20989790), (2, 10494895), (5, 4197958), (10, 2098979), (31, 677090), (62, 338545), (155, 135418), (310, 67709)]