21681940

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{154871}}^1$

素因数の和:154887

約数の個数: 24

約数和(自身を含む): 52036992

約数和(自身を除く): 30355052

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 154871, 309742, 619484, 774355, 1084097, 1548710, 2168194, 3097420, 4336388, 5420485, 10840970, 21681940]

約数ペア:

[(1, 21681940), (2, 10840970), (4, 5420485), (5, 4336388), (7, 3097420), (10, 2168194), (14, 1548710), (20, 1084097), (28, 774355), (35, 619484), (70, 309742), (140, 154871)]