21919640

素因数分解:

$2^3\times 5^1\times {\mathrm{443}}^1\times {\mathrm{1237}}^1$

素因数の和:1691

約数の個数: 32

約数和(自身を含む): 49470480

約数和(自身を除く): 27550840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 443, 886, 1237, 1772, 2215, 2474, 3544, 4430, 4948, 6185, 8860, 9896, 12370, 17720, 24740, 49480, 547991, 1095982, 2191964, 2739955, 4383928, 5479910, 10959820, 21919640]

約数ペア:

[(1, 21919640), (2, 10959820), (4, 5479910), (5, 4383928), (8, 2739955), (10, 2191964), (20, 1095982), (40, 547991), (443, 49480), (886, 24740), (1237, 17720), (1772, 12370), (2215, 9896), (2474, 8860), (3544, 6185), (4430, 4948)]