20991120

素因数分解:

$2^4\times 3^1\times 5^1\times {\mathrm{149}}^1\times {\mathrm{587}}^1$

素因数の和:752

約数の個数: 80

約数和(自身を含む): 65620800

約数和(自身を除く): 44629680

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120, 149, 240, 298, 447, 587, 596, 745, 894, 1174, 1192, 1490, 1761, 1788, 2235, 2348, 2384, 2935, 2980, 3522, 3576, 4470, 4696, 5870, 5960, 7044, 7152, 8805, 8940, 9392, 11740, 11920, 14088, 17610, 17880, 23480, 28176, 35220, 35760, 46960, 70440, 87463, 140880, 174926, 262389, 349852, 437315, 524778, 699704, 874630, 1049556, 1311945, 1399408, 1749260, 2099112, 2623890, 3498520, 4198224, 5247780, 6997040, 10495560, 20991120]

約数ペア:

[(1, 20991120), (2, 10495560), (3, 6997040), (4, 5247780), (5, 4198224), (6, 3498520), (8, 2623890), (10, 2099112), (12, 1749260), (15, 1399408), (16, 1311945), (20, 1049556), (24, 874630), (30, 699704), (40, 524778), (48, 437315), (60, 349852), (80, 262389), (120, 174926), (149, 140880), (240, 87463), (298, 70440), (447, 46960), (587, 35760), (596, 35220), (745, 28176), (894, 23480), (1174, 17880), (1192, 17610), (1490, 14088), (1761, 11920), (1788, 11740), (2235, 9392), (2348, 8940), (2384, 8805), (2935, 7152), (2980, 7044), (3522, 5960), (3576, 5870), (4470, 4696)]