21208905

素因数分解:

$3^3\times 5^1\times {\mathrm{157103}}^1$

素因数の和:157117

約数の個数: 16

約数和(自身を含む): 37704960

約数和(自身を除く): 16496055

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 157103, 471309, 785515, 1413927, 2356545, 4241781, 7069635, 21208905]

約数ペア:

[(1, 21208905), (3, 7069635), (5, 4241781), (9, 2356545), (15, 1413927), (27, 785515), (45, 471309), (135, 157103)]