20556440

素因数分解:

$2^3\times 5^1\times {\mathrm{653}}^1\times {\mathrm{787}}^1$

素因数の和:1451

約数の個数: 32

約数和(自身を含む): 46381680

約数和(自身を除く): 25825240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 653, 787, 1306, 1574, 2612, 3148, 3265, 3935, 5224, 6296, 6530, 7870, 13060, 15740, 26120, 31480, 513911, 1027822, 2055644, 2569555, 4111288, 5139110, 10278220, 20556440]

約数ペア:

[(1, 20556440), (2, 10278220), (4, 5139110), (5, 4111288), (8, 2569555), (10, 2055644), (20, 1027822), (40, 513911), (653, 31480), (787, 26120), (1306, 15740), (1574, 13060), (2612, 7870), (3148, 6530), (3265, 6296), (3935, 5224)]