20911780

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{113}}^1\times {\mathrm{487}}^1$

素因数の和:628

約数の個数: 48

約数和(自身を含む): 46730880

約数和(自身を除く): 25819100

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 113, 190, 226, 380, 452, 487, 565, 974, 1130, 1948, 2147, 2260, 2435, 4294, 4870, 8588, 9253, 9740, 10735, 18506, 21470, 37012, 42940, 46265, 55031, 92530, 110062, 185060, 220124, 275155, 550310, 1045589, 1100620, 2091178, 4182356, 5227945, 10455890, 20911780]

約数ペア:

[(1, 20911780), (2, 10455890), (4, 5227945), (5, 4182356), (10, 2091178), (19, 1100620), (20, 1045589), (38, 550310), (76, 275155), (95, 220124), (113, 185060), (190, 110062), (226, 92530), (380, 55031), (452, 46265), (487, 42940), (565, 37012), (974, 21470), (1130, 18506), (1948, 10735), (2147, 9740), (2260, 9253), (2435, 8588), (4294, 4870)]