18720680

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{157}}^1\times {\mathrm{271}}^1$

素因数の和:450

約数の個数: 64

約数和(自身を含む): 46414080

約数和(自身を除く): 27693400

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 157, 220, 271, 314, 440, 542, 628, 785, 1084, 1256, 1355, 1570, 1727, 2168, 2710, 2981, 3140, 3454, 5420, 5962, 6280, 6908, 8635, 10840, 11924, 13816, 14905, 17270, 23848, 29810, 34540, 42547, 59620, 69080, 85094, 119240, 170188, 212735, 340376, 425470, 468017, 850940, 936034, 1701880, 1872068, 2340085, 3744136, 4680170, 9360340, 18720680]

約数ペア:

[(1, 18720680), (2, 9360340), (4, 4680170), (5, 3744136), (8, 2340085), (10, 1872068), (11, 1701880), (20, 936034), (22, 850940), (40, 468017), (44, 425470), (55, 340376), (88, 212735), (110, 170188), (157, 119240), (220, 85094), (271, 69080), (314, 59620), (440, 42547), (542, 34540), (628, 29810), (785, 23848), (1084, 17270), (1256, 14905), (1355, 13816), (1570, 11924), (1727, 10840), (2168, 8635), (2710, 6908), (2981, 6280), (3140, 5962), (3454, 5420)]