21050865

素因数分解:

$3^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{43}}^2$

素因数の和:131

約数の個数: 72

約数和(自身を含む): 42524352

約数和(自身を除く): 21473487

約数列:

[1, 3, 5, 9, 11, 15, 23, 33, 43, 45, 55, 69, 99, 115, 129, 165, 207, 215, 253, 345, 387, 473, 495, 645, 759, 989, 1035, 1265, 1419, 1849, 1935, 2277, 2365, 2967, 3795, 4257, 4945, 5547, 7095, 8901, 9245, 10879, 11385, 14835, 16641, 20339, 21285, 27735, 32637, 42527, 44505, 54395, 61017, 83205, 97911, 101695, 127581, 163185, 183051, 212635, 305085, 382743, 467797, 489555, 637905, 915255, 1403391, 1913715, 2338985, 4210173, 7016955, 21050865]

約数ペア:

[(1, 21050865), (3, 7016955), (5, 4210173), (9, 2338985), (11, 1913715), (15, 1403391), (23, 915255), (33, 637905), (43, 489555), (45, 467797), (55, 382743), (69, 305085), (99, 212635), (115, 183051), (129, 163185), (165, 127581), (207, 101695), (215, 97911), (253, 83205), (345, 61017), (387, 54395), (473, 44505), (495, 42527), (645, 32637), (759, 27735), (989, 21285), (1035, 20339), (1265, 16641), (1419, 14835), (1849, 11385), (1935, 10879), (2277, 9245), (2365, 8901), (2967, 7095), (3795, 5547), (4257, 4945)]