21326409

素因数分解:

$3^5\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{157}}^1$

素因数の和:228

約数の個数: 48

約数和(自身を含む): 35427392

約数和(自身を除く): 14100983

約数列:

[1, 3, 9, 13, 27, 39, 43, 81, 117, 129, 157, 243, 351, 387, 471, 559, 1053, 1161, 1413, 1677, 2041, 3159, 3483, 4239, 5031, 6123, 6751, 10449, 12717, 15093, 18369, 20253, 38151, 45279, 55107, 60759, 87763, 135837, 165321, 182277, 263289, 495963, 546831, 789867, 1640493, 2369601, 7108803, 21326409]

約数ペア:

[(1, 21326409), (3, 7108803), (9, 2369601), (13, 1640493), (27, 789867), (39, 546831), (43, 495963), (81, 263289), (117, 182277), (129, 165321), (157, 135837), (243, 87763), (351, 60759), (387, 55107), (471, 45279), (559, 38151), (1053, 20253), (1161, 18369), (1413, 15093), (1677, 12717), (2041, 10449), (3159, 6751), (3483, 6123), (4239, 5031)]