20988495

素因数分解:

$3^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{109}}^1\times {\mathrm{389}}^1$

素因数の和:520

約数の個数: 48

約数和(自身を含む): 40154400

約数和(自身を除く): 19165905

約数列:

[1, 3, 5, 9, 11, 15, 33, 45, 55, 99, 109, 165, 327, 389, 495, 545, 981, 1167, 1199, 1635, 1945, 3501, 3597, 4279, 4905, 5835, 5995, 10791, 12837, 17505, 17985, 21395, 38511, 42401, 53955, 64185, 127203, 192555, 212005, 381609, 466411, 636015, 1399233, 1908045, 2332055, 4197699, 6996165, 20988495]

約数ペア:

[(1, 20988495), (3, 6996165), (5, 4197699), (9, 2332055), (11, 1908045), (15, 1399233), (33, 636015), (45, 466411), (55, 381609), (99, 212005), (109, 192555), (165, 127203), (327, 64185), (389, 53955), (495, 42401), (545, 38511), (981, 21395), (1167, 17985), (1199, 17505), (1635, 12837), (1945, 10791), (3501, 5995), (3597, 5835), (4279, 4905)]