21687831

素因数分解:

$3^4\times {\mathrm{11}}^1\times {\mathrm{101}}^1\times {\mathrm{241}}^1$

素因数の和:365

約数の個数: 40

約数和(自身を含む): 35841168

約数和(自身を除く): 14153337

約数列:

[1, 3, 9, 11, 27, 33, 81, 99, 101, 241, 297, 303, 723, 891, 909, 1111, 2169, 2651, 2727, 3333, 6507, 7953, 8181, 9999, 19521, 23859, 24341, 29997, 71577, 73023, 89991, 214731, 219069, 267751, 657207, 803253, 1971621, 2409759, 7229277, 21687831]

約数ペア:

[(1, 21687831), (3, 7229277), (9, 2409759), (11, 1971621), (27, 803253), (33, 657207), (81, 267751), (99, 219069), (101, 214731), (241, 89991), (297, 73023), (303, 71577), (723, 29997), (891, 24341), (909, 23859), (1111, 19521), (2169, 9999), (2651, 8181), (2727, 7953), (3333, 6507)]