20528840

素因数分解:

$2^3\times 5^1\times {\mathrm{199}}^1\times {\mathrm{2579}}^1$

素因数の和:2789

約数の個数: 32

約数和(自身を含む): 46440000

約数和(自身を除く): 25911160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 199, 398, 796, 995, 1592, 1990, 2579, 3980, 5158, 7960, 10316, 12895, 20632, 25790, 51580, 103160, 513221, 1026442, 2052884, 2566105, 4105768, 5132210, 10264420, 20528840]

約数ペア:

[(1, 20528840), (2, 10264420), (4, 5132210), (5, 4105768), (8, 2566105), (10, 2052884), (20, 1026442), (40, 513221), (199, 103160), (398, 51580), (796, 25790), (995, 20632), (1592, 12895), (1990, 10316), (2579, 7960), (3980, 5158)]