21257080

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{40879}}^1$

素因数の和:40903

約数の個数: 32

約数和(自身を含む): 51508800

約数和(自身を除く): 30251720

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 40879, 81758, 163516, 204395, 327032, 408790, 531427, 817580, 1062854, 1635160, 2125708, 2657135, 4251416, 5314270, 10628540, 21257080]

約数ペア:

[(1, 21257080), (2, 10628540), (4, 5314270), (5, 4251416), (8, 2657135), (10, 2125708), (13, 1635160), (20, 1062854), (26, 817580), (40, 531427), (52, 408790), (65, 327032), (104, 204395), (130, 163516), (260, 81758), (520, 40879)]