20917000

素因数分解:

$2^3\times 5^3\times {\mathrm{13}}^1\times {\mathrm{1609}}^1$

素因数の和:1643

約数の個数: 64

約数和(自身を含む): 52743600

約数和(自身を除く): 31826600

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 25, 26, 40, 50, 52, 65, 100, 104, 125, 130, 200, 250, 260, 325, 500, 520, 650, 1000, 1300, 1609, 1625, 2600, 3218, 3250, 6436, 6500, 8045, 12872, 13000, 16090, 20917, 32180, 40225, 41834, 64360, 80450, 83668, 104585, 160900, 167336, 201125, 209170, 321800, 402250, 418340, 522925, 804500, 836680, 1045850, 1609000, 2091700, 2614625, 4183400, 5229250, 10458500, 20917000]

約数ペア:

[(1, 20917000), (2, 10458500), (4, 5229250), (5, 4183400), (8, 2614625), (10, 2091700), (13, 1609000), (20, 1045850), (25, 836680), (26, 804500), (40, 522925), (50, 418340), (52, 402250), (65, 321800), (100, 209170), (104, 201125), (125, 167336), (130, 160900), (200, 104585), (250, 83668), (260, 80450), (325, 64360), (500, 41834), (520, 40225), (650, 32180), (1000, 20917), (1300, 16090), (1609, 13000), (1625, 12872), (2600, 8045), (3218, 6500), (3250, 6436)]