20638990

素因数分解:

$2^1\times 5^1\times {\mathrm{41}}^1\times {\mathrm{71}}^1\times {\mathrm{709}}^1$

素因数の和:828

約数の個数: 32

約数和(自身を含む): 38646720

約数和(自身を除く): 18007730

約数列:

[1, 2, 5, 10, 41, 71, 82, 142, 205, 355, 410, 709, 710, 1418, 2911, 3545, 5822, 7090, 14555, 29069, 29110, 50339, 58138, 100678, 145345, 251695, 290690, 503390, 2063899, 4127798, 10319495, 20638990]

約数ペア:

[(1, 20638990), (2, 10319495), (5, 4127798), (10, 2063899), (41, 503390), (71, 290690), (82, 251695), (142, 145345), (205, 100678), (355, 58138), (410, 50339), (709, 29110), (710, 29069), (1418, 14555), (2911, 7090), (3545, 5822)]