20991260

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{107}}^1\times {\mathrm{577}}^1$

素因数の和:710

約数の個数: 48

約数和(自身を含む): 47192544

約数和(自身を除く): 26201284

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 107, 170, 214, 340, 428, 535, 577, 1070, 1154, 1819, 2140, 2308, 2885, 3638, 5770, 7276, 9095, 9809, 11540, 18190, 19618, 36380, 39236, 49045, 61739, 98090, 123478, 196180, 246956, 308695, 617390, 1049563, 1234780, 2099126, 4198252, 5247815, 10495630, 20991260]

約数ペア:

[(1, 20991260), (2, 10495630), (4, 5247815), (5, 4198252), (10, 2099126), (17, 1234780), (20, 1049563), (34, 617390), (68, 308695), (85, 246956), (107, 196180), (170, 123478), (214, 98090), (340, 61739), (428, 49045), (535, 39236), (577, 36380), (1070, 19618), (1154, 18190), (1819, 11540), (2140, 9809), (2308, 9095), (2885, 7276), (3638, 5770)]