21256905

素因数分解:

$3^1\times 5^1\times {\mathrm{389}}^1\times {\mathrm{3643}}^1$

素因数の和:4040

約数の個数: 16

約数和(自身を含む): 34107840

約数和(自身を除く): 12850935

約数列:

[1, 3, 5, 15, 389, 1167, 1945, 3643, 5835, 10929, 18215, 54645, 1417127, 4251381, 7085635, 21256905]

約数ペア:

[(1, 21256905), (3, 7085635), (5, 4251381), (15, 1417127), (389, 54645), (1167, 18215), (1945, 10929), (3643, 5835)]