21213997

素因数分解:

$7^1\times {\mathrm{97}}^1\times {\mathrm{157}}^1\times {\mathrm{199}}^1$

素因数の和:460

約数の個数: 16

約数和(自身を含む): 24774400

約数和(自身を除く): 3560403

約数列:

[1, 7, 97, 157, 199, 679, 1099, 1393, 15229, 19303, 31243, 106603, 135121, 218701, 3030571, 21213997]

約数ペア:

[(1, 21213997), (7, 3030571), (97, 218701), (157, 135121), (199, 106603), (679, 31243), (1099, 19303), (1393, 15229)]