20989490

素因数分解:

$2^1\times 5^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{1811}}^1$

素因数の和:1898

約数の個数: 32

約数和(自身を含む): 40443840

約数和(自身を除く): 19454350

約数列:

[1, 2, 5, 10, 19, 38, 61, 95, 122, 190, 305, 610, 1159, 1811, 2318, 3622, 5795, 9055, 11590, 18110, 34409, 68818, 110471, 172045, 220942, 344090, 552355, 1104710, 2098949, 4197898, 10494745, 20989490]

約数ペア:

[(1, 20989490), (2, 10494745), (5, 4197898), (10, 2098949), (19, 1104710), (38, 552355), (61, 344090), (95, 220942), (122, 172045), (190, 110471), (305, 68818), (610, 34409), (1159, 18110), (1811, 11590), (2318, 9055), (3622, 5795)]