21687080

素因数分解:

$2^3\times 5^1\times {\mathrm{79}}^1\times {\mathrm{6863}}^1$

素因数の和:6953

約数の個数: 32

約数和(自身を含む): 49420800

約数和(自身を除く): 27733720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 79, 158, 316, 395, 632, 790, 1580, 3160, 6863, 13726, 27452, 34315, 54904, 68630, 137260, 274520, 542177, 1084354, 2168708, 2710885, 4337416, 5421770, 10843540, 21687080]

約数ペア:

[(1, 21687080), (2, 10843540), (4, 5421770), (5, 4337416), (8, 2710885), (10, 2168708), (20, 1084354), (40, 542177), (79, 274520), (158, 137260), (316, 68630), (395, 54904), (632, 34315), (790, 27452), (1580, 13726), (3160, 6863)]