21399820

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{82307}}^1$

素因数の和:82329

約数の個数: 24

約数和(自身を含む): 48397104

約数和(自身を除く): 26997284

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 82307, 164614, 329228, 411535, 823070, 1069991, 1646140, 2139982, 4279964, 5349955, 10699910, 21399820]

約数ペア:

[(1, 21399820), (2, 10699910), (4, 5349955), (5, 4279964), (10, 2139982), (13, 1646140), (20, 1069991), (26, 823070), (52, 411535), (65, 329228), (130, 164614), (260, 82307)]