642621880

素因数分解:

$2^3\times 5^1\times {\mathrm{197}}^1\times {\mathrm{81551}}^1$

素因数の和:81759

約数の個数: 32

約数和(自身を含む): 1453256640

約数和(自身を除く): 810634760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 197, 394, 788, 985, 1576, 1970, 3940, 7880, 81551, 163102, 326204, 407755, 652408, 815510, 1631020, 3262040, 16065547, 32131094, 64262188, 80327735, 128524376, 160655470, 321310940, 642621880]

約数ペア:

[(1, 642621880), (2, 321310940), (4, 160655470), (5, 128524376), (8, 80327735), (10, 64262188), (20, 32131094), (40, 16065547), (197, 3262040), (394, 1631020), (788, 815510), (985, 652408), (1576, 407755), (1970, 326204), (3940, 163102), (7880, 81551)]