20942480

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^2\times {\mathrm{1549}}^1$

素因数の和:1588

約数の個数: 60

約数和(自身を含む): 52758900

約数和(自身を除く): 31816420

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 169, 208, 260, 338, 520, 676, 845, 1040, 1352, 1549, 1690, 2704, 3098, 3380, 6196, 6760, 7745, 12392, 13520, 15490, 20137, 24784, 30980, 40274, 61960, 80548, 100685, 123920, 161096, 201370, 261781, 322192, 402740, 523562, 805480, 1047124, 1308905, 1610960, 2094248, 2617810, 4188496, 5235620, 10471240, 20942480]

約数ペア:

[(1, 20942480), (2, 10471240), (4, 5235620), (5, 4188496), (8, 2617810), (10, 2094248), (13, 1610960), (16, 1308905), (20, 1047124), (26, 805480), (40, 523562), (52, 402740), (65, 322192), (80, 261781), (104, 201370), (130, 161096), (169, 123920), (208, 100685), (260, 80548), (338, 61960), (520, 40274), (676, 30980), (845, 24784), (1040, 20137), (1352, 15490), (1549, 13520), (1690, 12392), (2704, 7745), (3098, 6760), (3380, 6196)]