21153879

素因数分解:

$3^5\times {\mathrm{263}}^1\times {\mathrm{331}}^1$

素因数の和:609

約数の個数: 24

約数和(自身を含む): 31903872

約数和(自身を除く): 10749993

約数列:

[1, 3, 9, 27, 81, 243, 263, 331, 789, 993, 2367, 2979, 7101, 8937, 21303, 26811, 63909, 80433, 87053, 261159, 783477, 2350431, 7051293, 21153879]

約数ペア:

[(1, 21153879), (3, 7051293), (9, 2350431), (27, 783477), (81, 261159), (243, 87053), (263, 80433), (331, 63909), (789, 26811), (993, 21303), (2367, 8937), (2979, 7101)]