21213009

素因数分解:

$3^4\times {\mathrm{379}}^1\times {\mathrm{691}}^1$

素因数の和:1082

約数の個数: 20

約数和(自身を含む): 31818160

約数和(自身を除く): 10605151

約数列:

[1, 3, 9, 27, 81, 379, 691, 1137, 2073, 3411, 6219, 10233, 18657, 30699, 55971, 261889, 785667, 2357001, 7071003, 21213009]

約数ペア:

[(1, 21213009), (3, 7071003), (9, 2357001), (27, 785667), (81, 261889), (379, 55971), (691, 30699), (1137, 18657), (2073, 10233), (3411, 6219)]