78871720

素因数分解:

$2^3\times 5^1\times {\mathrm{443}}^1\times {\mathrm{4451}}^1$

素因数の和:4905

約数の個数: 32

約数和(自身を含む): 177901920

約数和(自身を除く): 99030200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 443, 886, 1772, 2215, 3544, 4430, 4451, 8860, 8902, 17720, 17804, 22255, 35608, 44510, 89020, 178040, 1971793, 3943586, 7887172, 9858965, 15774344, 19717930, 39435860, 78871720]

約数ペア:

[(1, 78871720), (2, 39435860), (4, 19717930), (5, 15774344), (8, 9858965), (10, 7887172), (20, 3943586), (40, 1971793), (443, 178040), (886, 89020), (1772, 44510), (2215, 35608), (3544, 22255), (4430, 17804), (4451, 17720), (8860, 8902)]