21457791

素因数分解:

$3^4\times {\mathrm{17}}^1\times {\mathrm{15583}}^1$

素因数の和:15612

約数の個数: 20

約数和(自身を含む): 33941952

約数和(自身を除く): 12484161

約数列:

[1, 3, 9, 17, 27, 51, 81, 153, 459, 1377, 15583, 46749, 140247, 264911, 420741, 794733, 1262223, 2384199, 7152597, 21457791]

約数ペア:

[(1, 21457791), (3, 7152597), (9, 2384199), (17, 1262223), (27, 794733), (51, 420741), (81, 264911), (153, 140247), (459, 46749), (1377, 15583)]