21318309

素因数分解:

$3^4\times {\mathrm{23}}^1\times {\mathrm{11443}}^1$

素因数の和:11478

約数の個数: 20

約数和(自身を含む): 33233376

約数和(自身を除く): 11915067

約数列:

[1, 3, 9, 23, 27, 69, 81, 207, 621, 1863, 11443, 34329, 102987, 263189, 308961, 789567, 926883, 2368701, 7106103, 21318309]

約数ペア:

[(1, 21318309), (3, 7106103), (9, 2368701), (23, 926883), (27, 789567), (69, 308961), (81, 263189), (207, 102987), (621, 34329), (1863, 11443)]