20805590

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^3\times {\mathrm{947}}^1$

素因数の和:993

約数の個数: 32

約数和(自身を含む): 40612320

約数和(自身を除く): 19806730

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 169, 338, 845, 947, 1690, 1894, 2197, 4394, 4735, 9470, 10985, 12311, 21970, 24622, 61555, 123110, 160043, 320086, 800215, 1600430, 2080559, 4161118, 10402795, 20805590]

約数ペア:

[(1, 20805590), (2, 10402795), (5, 4161118), (10, 2080559), (13, 1600430), (26, 800215), (65, 320086), (130, 160043), (169, 123110), (338, 61555), (845, 24622), (947, 21970), (1690, 12311), (1894, 10985), (2197, 9470), (4394, 4735)]