20507890

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{73}}^1\times {\mathrm{2161}}^1$

素因数の和:2254

約数の個数: 32

約数和(自身を含む): 40316976

約数和(自身を除く): 19809086

約数列:

[1, 2, 5, 10, 13, 26, 65, 73, 130, 146, 365, 730, 949, 1898, 2161, 4322, 4745, 9490, 10805, 21610, 28093, 56186, 140465, 157753, 280930, 315506, 788765, 1577530, 2050789, 4101578, 10253945, 20507890]

約数ペア:

[(1, 20507890), (2, 10253945), (5, 4101578), (10, 2050789), (13, 1577530), (26, 788765), (65, 315506), (73, 280930), (130, 157753), (146, 140465), (365, 56186), (730, 28093), (949, 21610), (1898, 10805), (2161, 9490), (4322, 4745)]