661340

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{769}}^1$

素因数の和:821

約数の個数: 24

約数和(自身を含む): 1422960

約数和(自身を除く): 761620

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 172, 215, 430, 769, 860, 1538, 3076, 3845, 7690, 15380, 33067, 66134, 132268, 165335, 330670, 661340]

約数ペア:

[(1, 661340), (2, 330670), (4, 165335), (5, 132268), (10, 66134), (20, 33067), (43, 15380), (86, 7690), (172, 3845), (215, 3076), (430, 1538), (769, 860)]