21515241

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{67}}^1\times {\mathrm{263}}^1$

素因数の和:381

約数の個数: 32

約数和(自身を含む): 32744448

約数和(自身を除く): 11229207

約数列:

[1, 3, 11, 33, 37, 67, 111, 201, 263, 407, 737, 789, 1221, 2211, 2479, 2893, 7437, 8679, 9731, 17621, 27269, 29193, 52863, 81807, 107041, 193831, 321123, 581493, 651977, 1955931, 7171747, 21515241]

約数ペア:

[(1, 21515241), (3, 7171747), (11, 1955931), (33, 651977), (37, 581493), (67, 321123), (111, 193831), (201, 107041), (263, 81807), (407, 52863), (737, 29193), (789, 27269), (1221, 17621), (2211, 9731), (2479, 8679), (2893, 7437)]