18747981

素因数分解:

$3^2\times 7^1\times {\mathrm{523}}^1\times {\mathrm{569}}^1$

素因数の和:1105

約数の個数: 24

約数和(自身を含む): 31062720

約数和(自身を除く): 12314739

約数列:

[1, 3, 7, 9, 21, 63, 523, 569, 1569, 1707, 3661, 3983, 4707, 5121, 10983, 11949, 32949, 35847, 297587, 892761, 2083109, 2678283, 6249327, 18747981]

約数ペア:

[(1, 18747981), (3, 6249327), (7, 2678283), (9, 2083109), (21, 892761), (63, 297587), (523, 35847), (569, 32949), (1569, 11949), (1707, 10983), (3661, 5121), (3983, 4707)]