21279978

素因数分解:

$2^1\times 3^2\times {\mathrm{71}}^1\times {\mathrm{16651}}^1$

素因数の和:16730

約数の個数: 24

約数和(自身を含む): 46758816

約数和(自身を除く): 25478838

約数列:

[1, 2, 3, 6, 9, 18, 71, 142, 213, 426, 639, 1278, 16651, 33302, 49953, 99906, 149859, 299718, 1182221, 2364442, 3546663, 7093326, 10639989, 21279978]

約数ペア:

[(1, 21279978), (2, 10639989), (3, 7093326), (6, 3546663), (9, 2364442), (18, 1182221), (71, 299718), (142, 149859), (213, 99906), (426, 49953), (639, 33302), (1278, 16651)]