20290000

素因数分解:

$2^4\times 5^4\times {\mathrm{2029}}^1$

素因数の和:2057

約数の個数: 50

約数和(自身を含む): 49148330

約数和(自身を除く): 28858330

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 125, 200, 250, 400, 500, 625, 1000, 1250, 2000, 2029, 2500, 4058, 5000, 8116, 10000, 10145, 16232, 20290, 32464, 40580, 50725, 81160, 101450, 162320, 202900, 253625, 405800, 507250, 811600, 1014500, 1268125, 2029000, 2536250, 4058000, 5072500, 10145000, 20290000]

約数ペア:

[(1, 20290000), (2, 10145000), (4, 5072500), (5, 4058000), (8, 2536250), (10, 2029000), (16, 1268125), (20, 1014500), (25, 811600), (40, 507250), (50, 405800), (80, 253625), (100, 202900), (125, 162320), (200, 101450), (250, 81160), (400, 50725), (500, 40580), (625, 32464), (1000, 20290), (1250, 16232), (2000, 10145), (2029, 10000), (2500, 8116), (4058, 5000)]