21905721

素因数分解:

$3^6\times {\mathrm{151}}^1\times {\mathrm{199}}^1$

素因数の和:368

約数の個数: 28

約数和(自身を含む): 33227200

約数和(自身を除く): 11321479

約数列:

[1, 3, 9, 27, 81, 151, 199, 243, 453, 597, 729, 1359, 1791, 4077, 5373, 12231, 16119, 30049, 36693, 48357, 90147, 110079, 145071, 270441, 811323, 2433969, 7301907, 21905721]

約数ペア:

[(1, 21905721), (3, 7301907), (9, 2433969), (27, 811323), (81, 270441), (151, 145071), (199, 110079), (243, 90147), (453, 48357), (597, 36693), (729, 30049), (1359, 16119), (1791, 12231), (4077, 5373)]