18891620

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{1997}}^1$

素因数の和:2060

約数の個数: 48

約数和(自身を含む): 44307648

約数和(自身を除く): 25416028

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 43, 44, 55, 86, 110, 172, 215, 220, 430, 473, 860, 946, 1892, 1997, 2365, 3994, 4730, 7988, 9460, 9985, 19970, 21967, 39940, 43934, 85871, 87868, 109835, 171742, 219670, 343484, 429355, 439340, 858710, 944581, 1717420, 1889162, 3778324, 4722905, 9445810, 18891620]

約数ペア:

[(1, 18891620), (2, 9445810), (4, 4722905), (5, 3778324), (10, 1889162), (11, 1717420), (20, 944581), (22, 858710), (43, 439340), (44, 429355), (55, 343484), (86, 219670), (110, 171742), (172, 109835), (215, 87868), (220, 85871), (430, 43934), (473, 39940), (860, 21967), (946, 19970), (1892, 9985), (1997, 9460), (2365, 7988), (3994, 4730)]