21285920

素因数分解:

$2^5\times 5^1\times {\mathrm{173}}^1\times {\mathrm{769}}^1$

素因数の和:957

約数の個数: 48

約数和(自身を含む): 50644440

約数和(自身を除く): 29358520

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 173, 346, 692, 769, 865, 1384, 1538, 1730, 2768, 3076, 3460, 3845, 5536, 6152, 6920, 7690, 12304, 13840, 15380, 24608, 27680, 30760, 61520, 123040, 133037, 266074, 532148, 665185, 1064296, 1330370, 2128592, 2660740, 4257184, 5321480, 10642960, 21285920]

約数ペア:

[(1, 21285920), (2, 10642960), (4, 5321480), (5, 4257184), (8, 2660740), (10, 2128592), (16, 1330370), (20, 1064296), (32, 665185), (40, 532148), (80, 266074), (160, 133037), (173, 123040), (346, 61520), (692, 30760), (769, 27680), (865, 24608), (1384, 15380), (1538, 13840), (1730, 12304), (2768, 7690), (3076, 6920), (3460, 6152), (3845, 5536)]