21256191

素因数分解:

$3^2\times {\mathrm{11}}^2\times {\mathrm{131}}^1\times {\mathrm{149}}^1$

素因数の和:308

約数の個数: 36

約数和(自身を含む): 34234200

約数和(自身を除く): 12978009

約数列:

[1, 3, 9, 11, 33, 99, 121, 131, 149, 363, 393, 447, 1089, 1179, 1341, 1441, 1639, 4323, 4917, 12969, 14751, 15851, 18029, 19519, 47553, 54087, 58557, 142659, 162261, 175671, 214709, 644127, 1932381, 2361799, 7085397, 21256191]

約数ペア:

[(1, 21256191), (3, 7085397), (9, 2361799), (11, 1932381), (33, 644127), (99, 214709), (121, 175671), (131, 162261), (149, 142659), (363, 58557), (393, 54087), (447, 47553), (1089, 19519), (1179, 18029), (1341, 15851), (1441, 14751), (1639, 12969), (4323, 4917)]