21291579

素因数分解:

$3^4\times {\mathrm{43}}^1\times {\mathrm{6113}}^1$

素因数の和:6168

約数の個数: 20

約数和(自身を含む): 32550936

約数和(自身を除く): 11259357

約数列:

[1, 3, 9, 27, 43, 81, 129, 387, 1161, 3483, 6113, 18339, 55017, 165051, 262859, 495153, 788577, 2365731, 7097193, 21291579]

約数ペア:

[(1, 21291579), (3, 7097193), (9, 2365731), (27, 788577), (43, 495153), (81, 262859), (129, 165051), (387, 55017), (1161, 18339), (3483, 6113)]