21207249

素因数分解:

$3^2\times 7^2\times {\mathrm{19}}^1\times {\mathrm{2531}}^1$

素因数の和:2570

約数の個数: 36

約数和(自身を含む): 37524240

約数和(自身を除く): 16316991

約数列:

[1, 3, 7, 9, 19, 21, 49, 57, 63, 133, 147, 171, 399, 441, 931, 1197, 2531, 2793, 7593, 8379, 17717, 22779, 48089, 53151, 124019, 144267, 159453, 336623, 372057, 432801, 1009869, 1116171, 2356361, 3029607, 7069083, 21207249]

約数ペア:

[(1, 21207249), (3, 7069083), (7, 3029607), (9, 2356361), (19, 1116171), (21, 1009869), (49, 432801), (57, 372057), (63, 336623), (133, 159453), (147, 144267), (171, 124019), (399, 53151), (441, 48089), (931, 22779), (1197, 17717), (2531, 8379), (2793, 7593)]