81780520

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{18757}}^1$

素因数の和:18877

約数の個数: 32

約数和(自身を含む): 185704200

約数和(自身を除く): 103923680

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 218, 436, 545, 872, 1090, 2180, 4360, 18757, 37514, 75028, 93785, 150056, 187570, 375140, 750280, 2044513, 4089026, 8178052, 10222565, 16356104, 20445130, 40890260, 81780520]

約数ペア:

[(1, 81780520), (2, 40890260), (4, 20445130), (5, 16356104), (8, 10222565), (10, 8178052), (20, 4089026), (40, 2044513), (109, 750280), (218, 375140), (436, 187570), (545, 150056), (872, 93785), (1090, 75028), (2180, 37514), (4360, 18757)]