20717500

素因数分解:

$2^2\times 5^4\times {\mathrm{8287}}^1$

素因数の和:8311

約数の個数: 30

約数和(自身を含む): 45310496

約数和(自身を除く): 24592996

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 125, 250, 500, 625, 1250, 2500, 8287, 16574, 33148, 41435, 82870, 165740, 207175, 414350, 828700, 1035875, 2071750, 4143500, 5179375, 10358750, 20717500]

約数ペア:

[(1, 20717500), (2, 10358750), (4, 5179375), (5, 4143500), (10, 2071750), (20, 1035875), (25, 828700), (50, 414350), (100, 207175), (125, 165740), (250, 82870), (500, 41435), (625, 33148), (1250, 16574), (2500, 8287)]