21132640

素因数分解:

$2^5\times 5^1\times {\mathrm{269}}^1\times {\mathrm{491}}^1$

素因数の和:775

約数の個数: 48

約数和(自身を含む): 50213520

約数和(自身を除く): 29080880

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 269, 491, 538, 982, 1076, 1345, 1964, 2152, 2455, 2690, 3928, 4304, 4910, 5380, 7856, 8608, 9820, 10760, 15712, 19640, 21520, 39280, 43040, 78560, 132079, 264158, 528316, 660395, 1056632, 1320790, 2113264, 2641580, 4226528, 5283160, 10566320, 21132640]

約数ペア:

[(1, 21132640), (2, 10566320), (4, 5283160), (5, 4226528), (8, 2641580), (10, 2113264), (16, 1320790), (20, 1056632), (32, 660395), (40, 528316), (80, 264158), (160, 132079), (269, 78560), (491, 43040), (538, 39280), (982, 21520), (1076, 19640), (1345, 15712), (1964, 10760), (2152, 9820), (2455, 8608), (2690, 7856), (3928, 5380), (4304, 4910)]