18720280

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^2\times {\mathrm{487}}^1$

素因数の和:560

約数の個数: 48

約数和(自身を含む): 43612560

約数和(自身を除く): 24892280

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 487, 620, 961, 974, 1240, 1922, 1948, 2435, 3844, 3896, 4805, 4870, 7688, 9610, 9740, 15097, 19220, 19480, 30194, 38440, 60388, 75485, 120776, 150970, 301940, 468007, 603880, 936014, 1872028, 2340035, 3744056, 4680070, 9360140, 18720280]

約数ペア:

[(1, 18720280), (2, 9360140), (4, 4680070), (5, 3744056), (8, 2340035), (10, 1872028), (20, 936014), (31, 603880), (40, 468007), (62, 301940), (124, 150970), (155, 120776), (248, 75485), (310, 60388), (487, 38440), (620, 30194), (961, 19480), (974, 19220), (1240, 15097), (1922, 9740), (1948, 9610), (2435, 7688), (3844, 4870), (3896, 4805)]