21618009

素因数分解:

$3^5\times 7^1\times {\mathrm{71}}^1\times {\mathrm{179}}^1$

素因数の和:272

約数の個数: 48

約数和(自身を含む): 37739520

約数和(自身を除く): 16121511

約数列:

[1, 3, 7, 9, 21, 27, 63, 71, 81, 179, 189, 213, 243, 497, 537, 567, 639, 1253, 1491, 1611, 1701, 1917, 3759, 4473, 4833, 5751, 11277, 12709, 13419, 14499, 17253, 33831, 38127, 40257, 43497, 88963, 101493, 114381, 120771, 266889, 304479, 343143, 800667, 1029429, 2402001, 3088287, 7206003, 21618009]

約数ペア:

[(1, 21618009), (3, 7206003), (7, 3088287), (9, 2402001), (21, 1029429), (27, 800667), (63, 343143), (71, 304479), (81, 266889), (179, 120771), (189, 114381), (213, 101493), (243, 88963), (497, 43497), (537, 40257), (567, 38127), (639, 33831), (1253, 17253), (1491, 14499), (1611, 13419), (1701, 12709), (1917, 11277), (3759, 5751), (4473, 4833)]