21219975

素因数分解:

$3^5\times 5^2\times 7^1\times {\mathrm{499}}^1$

素因数の和:531

約数の個数: 72

約数和(自身を含む): 45136000

約数和(自身を除く): 23916025

約数列:

[1, 3, 5, 7, 9, 15, 21, 25, 27, 35, 45, 63, 75, 81, 105, 135, 175, 189, 225, 243, 315, 405, 499, 525, 567, 675, 945, 1215, 1497, 1575, 1701, 2025, 2495, 2835, 3493, 4491, 4725, 6075, 7485, 8505, 10479, 12475, 13473, 14175, 17465, 22455, 31437, 37425, 40419, 42525, 52395, 67365, 87325, 94311, 112275, 121257, 157185, 202095, 261975, 282933, 336825, 471555, 606285, 785925, 848799, 1010475, 1414665, 2357775, 3031425, 4243995, 7073325, 21219975]

約数ペア:

[(1, 21219975), (3, 7073325), (5, 4243995), (7, 3031425), (9, 2357775), (15, 1414665), (21, 1010475), (25, 848799), (27, 785925), (35, 606285), (45, 471555), (63, 336825), (75, 282933), (81, 261975), (105, 202095), (135, 157185), (175, 121257), (189, 112275), (225, 94311), (243, 87325), (315, 67365), (405, 52395), (499, 42525), (525, 40419), (567, 37425), (675, 31437), (945, 22455), (1215, 17465), (1497, 14175), (1575, 13473), (1701, 12475), (2025, 10479), (2495, 8505), (2835, 7485), (3493, 6075), (4491, 4725)]