20450000

素因数分解:

$2^4\times 5^5\times {\mathrm{409}}^1$

素因数の和:442

約数の個数: 60

約数和(自身を含む): 49645260

約数和(自身を除く): 29195260

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 125, 200, 250, 400, 409, 500, 625, 818, 1000, 1250, 1636, 2000, 2045, 2500, 3125, 3272, 4090, 5000, 6250, 6544, 8180, 10000, 10225, 12500, 16360, 20450, 25000, 32720, 40900, 50000, 51125, 81800, 102250, 163600, 204500, 255625, 409000, 511250, 818000, 1022500, 1278125, 2045000, 2556250, 4090000, 5112500, 10225000, 20450000]

約数ペア:

[(1, 20450000), (2, 10225000), (4, 5112500), (5, 4090000), (8, 2556250), (10, 2045000), (16, 1278125), (20, 1022500), (25, 818000), (40, 511250), (50, 409000), (80, 255625), (100, 204500), (125, 163600), (200, 102250), (250, 81800), (400, 51125), (409, 50000), (500, 40900), (625, 32720), (818, 25000), (1000, 20450), (1250, 16360), (1636, 12500), (2000, 10225), (2045, 10000), (2500, 8180), (3125, 6544), (3272, 6250), (4090, 5000)]