20997075

素因数分解:

$3^1\times 5^2\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{821}}^1$

素因数の和:876

約数の個数: 48

約数和(自身を含む): 39140352

約数和(自身を除く): 18143277

約数列:

[1, 3, 5, 11, 15, 25, 31, 33, 55, 75, 93, 155, 165, 275, 341, 465, 775, 821, 825, 1023, 1705, 2325, 2463, 4105, 5115, 8525, 9031, 12315, 20525, 25451, 25575, 27093, 45155, 61575, 76353, 127255, 135465, 225775, 279961, 381765, 636275, 677325, 839883, 1399805, 1908825, 4199415, 6999025, 20997075]

約数ペア:

[(1, 20997075), (3, 6999025), (5, 4199415), (11, 1908825), (15, 1399805), (25, 839883), (31, 677325), (33, 636275), (55, 381765), (75, 279961), (93, 225775), (155, 135465), (165, 127255), (275, 76353), (341, 61575), (465, 45155), (775, 27093), (821, 25575), (825, 25451), (1023, 20525), (1705, 12315), (2325, 9031), (2463, 8525), (4105, 5115)]