21090280

素因数分解:

$2^3\times 5^1\times {\mathrm{103}}^1\times {\mathrm{5119}}^1$

素因数の和:5233

約数の個数: 32

約数和(自身を含む): 47923200

約数和(自身を除く): 26832920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 103, 206, 412, 515, 824, 1030, 2060, 4120, 5119, 10238, 20476, 25595, 40952, 51190, 102380, 204760, 527257, 1054514, 2109028, 2636285, 4218056, 5272570, 10545140, 21090280]

約数ペア:

[(1, 21090280), (2, 10545140), (4, 5272570), (5, 4218056), (8, 2636285), (10, 2109028), (20, 1054514), (40, 527257), (103, 204760), (206, 102380), (412, 51190), (515, 40952), (824, 25595), (1030, 20476), (2060, 10238), (4120, 5119)]