19977760

素因数分解:

$2^5\times 5^1\times {\mathrm{11}}^1\times {\mathrm{11351}}^1$

素因数の和:11377

約数の個数: 48

約数和(自身を含む): 51492672

約数和(自身を除く): 31514912

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 32, 40, 44, 55, 80, 88, 110, 160, 176, 220, 352, 440, 880, 1760, 11351, 22702, 45404, 56755, 90808, 113510, 124861, 181616, 227020, 249722, 363232, 454040, 499444, 624305, 908080, 998888, 1248610, 1816160, 1997776, 2497220, 3995552, 4994440, 9988880, 19977760]

約数ペア:

[(1, 19977760), (2, 9988880), (4, 4994440), (5, 3995552), (8, 2497220), (10, 1997776), (11, 1816160), (16, 1248610), (20, 998888), (22, 908080), (32, 624305), (40, 499444), (44, 454040), (55, 363232), (80, 249722), (88, 227020), (110, 181616), (160, 124861), (176, 113510), (220, 90808), (352, 56755), (440, 45404), (880, 22702), (1760, 11351)]