21005457

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{113}}^1\times {\mathrm{131}}^1$

素因数の和:301

約数の個数: 32

約数和(自身を含む): 31781376

約数和(自身を除く): 10775919

約数列:

[1, 3, 11, 33, 43, 113, 129, 131, 339, 393, 473, 1243, 1419, 1441, 3729, 4323, 4859, 5633, 14577, 14803, 16899, 44409, 53449, 61963, 160347, 162833, 185889, 488499, 636529, 1909587, 7001819, 21005457]

約数ペア:

[(1, 21005457), (3, 7001819), (11, 1909587), (33, 636529), (43, 488499), (113, 185889), (129, 162833), (131, 160347), (339, 61963), (393, 53449), (473, 44409), (1243, 16899), (1419, 14803), (1441, 14577), (3729, 5633), (4323, 4859)]