18237880

素因数分解:

$2^3\times 5^1\times {\mathrm{47}}^1\times {\mathrm{89}}^1\times {\mathrm{109}}^1$

素因数の和:256

約数の個数: 64

約数和(自身を含む): 42768000

約数和(自身を除く): 24530120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 47, 89, 94, 109, 178, 188, 218, 235, 356, 376, 436, 445, 470, 545, 712, 872, 890, 940, 1090, 1780, 1880, 2180, 3560, 4183, 4360, 5123, 8366, 9701, 10246, 16732, 19402, 20492, 20915, 25615, 33464, 38804, 40984, 41830, 48505, 51230, 77608, 83660, 97010, 102460, 167320, 194020, 204920, 388040, 455947, 911894, 1823788, 2279735, 3647576, 4559470, 9118940, 18237880]

約数ペア:

[(1, 18237880), (2, 9118940), (4, 4559470), (5, 3647576), (8, 2279735), (10, 1823788), (20, 911894), (40, 455947), (47, 388040), (89, 204920), (94, 194020), (109, 167320), (178, 102460), (188, 97010), (218, 83660), (235, 77608), (356, 51230), (376, 48505), (436, 41830), (445, 40984), (470, 38804), (545, 33464), (712, 25615), (872, 20915), (890, 20492), (940, 19402), (1090, 16732), (1780, 10246), (1880, 9701), (2180, 8366), (3560, 5123), (4183, 4360)]