20991060

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{277}}^1\times {\mathrm{421}}^1$

素因数の和:713

約数の個数: 72

約数和(自身を含む): 64054536

約数和(自身を除く): 43063476

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180, 277, 421, 554, 831, 842, 1108, 1263, 1385, 1662, 1684, 2105, 2493, 2526, 2770, 3324, 3789, 4155, 4210, 4986, 5052, 5540, 6315, 7578, 8310, 8420, 9972, 12465, 12630, 15156, 16620, 18945, 24930, 25260, 37890, 49860, 75780, 116617, 233234, 349851, 466468, 583085, 699702, 1049553, 1166170, 1399404, 1749255, 2099106, 2332340, 3498510, 4198212, 5247765, 6997020, 10495530, 20991060]

約数ペア:

[(1, 20991060), (2, 10495530), (3, 6997020), (4, 5247765), (5, 4198212), (6, 3498510), (9, 2332340), (10, 2099106), (12, 1749255), (15, 1399404), (18, 1166170), (20, 1049553), (30, 699702), (36, 583085), (45, 466468), (60, 349851), (90, 233234), (180, 116617), (277, 75780), (421, 49860), (554, 37890), (831, 25260), (842, 24930), (1108, 18945), (1263, 16620), (1385, 15156), (1662, 12630), (1684, 12465), (2105, 9972), (2493, 8420), (2526, 8310), (2770, 7578), (3324, 6315), (3789, 5540), (4155, 5052), (4210, 4986)]