21308721

素因数分解:

$3^1\times 7^1\times {\mathrm{199}}^1\times {\mathrm{5099}}^1$

素因数の和:5308

約数の個数: 16

約数和(自身を含む): 32640000

約数和(自身を除く): 11331279

約数列:

[1, 3, 7, 21, 199, 597, 1393, 4179, 5099, 15297, 35693, 107079, 1014701, 3044103, 7102907, 21308721]

約数ペア:

[(1, 21308721), (3, 7102907), (7, 3044103), (21, 1014701), (199, 107079), (597, 35693), (1393, 15297), (4179, 5099)]