640078640

素因数分解:

$2^4\times 5^1\times {\mathrm{8000983}}^1$

素因数の和:8000996

約数の個数: 20

約数和(自身を含む): 1488183024

約数和(自身を除く): 848104384

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 8000983, 16001966, 32003932, 40004915, 64007864, 80009830, 128015728, 160019660, 320039320, 640078640]

約数ペア:

[(1, 640078640), (2, 320039320), (4, 160019660), (5, 128015728), (8, 80009830), (10, 64007864), (16, 40004915), (20, 32003932), (40, 16001966), (80, 8000983)]