21091851

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{59}}^1\times {\mathrm{157}}^1$

素因数の和:256

約数の個数: 48

約数和(自身を含む): 35493120

約数和(自身を除く): 14401269

約数列:

[1, 3, 9, 11, 23, 33, 59, 69, 99, 157, 177, 207, 253, 471, 531, 649, 759, 1357, 1413, 1727, 1947, 2277, 3611, 4071, 5181, 5841, 9263, 10833, 12213, 14927, 15543, 27789, 32499, 39721, 44781, 83367, 101893, 119163, 134343, 213049, 305679, 357489, 639147, 917037, 1917441, 2343539, 7030617, 21091851]

約数ペア:

[(1, 21091851), (3, 7030617), (9, 2343539), (11, 1917441), (23, 917037), (33, 639147), (59, 357489), (69, 305679), (99, 213049), (157, 134343), (177, 119163), (207, 101893), (253, 83367), (471, 44781), (531, 39721), (649, 32499), (759, 27789), (1357, 15543), (1413, 14927), (1727, 12213), (1947, 10833), (2277, 9263), (3611, 5841), (4071, 5181)]