257752280

素因数分解:

$2^3\times 5^1\times {\mathrm{97}}^1\times {\mathrm{66431}}^1$

素因数の和:66539

約数の個数: 32

約数和(自身を含む): 585930240

約数和(自身を除く): 328177960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 97, 194, 388, 485, 776, 970, 1940, 3880, 66431, 132862, 265724, 332155, 531448, 664310, 1328620, 2657240, 6443807, 12887614, 25775228, 32219035, 51550456, 64438070, 128876140, 257752280]

約数ペア:

[(1, 257752280), (2, 128876140), (4, 64438070), (5, 51550456), (8, 32219035), (10, 25775228), (20, 12887614), (40, 6443807), (97, 2657240), (194, 1328620), (388, 664310), (485, 531448), (776, 332155), (970, 265724), (1940, 132862), (3880, 66431)]