20493880

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{47}}^1\times {\mathrm{991}}^1$

素因数の和:1060

約数の個数: 64

約数和(自身を含む): 51425280

約数和(自身を除く): 30931400

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 47, 55, 88, 94, 110, 188, 220, 235, 376, 440, 470, 517, 940, 991, 1034, 1880, 1982, 2068, 2585, 3964, 4136, 4955, 5170, 7928, 9910, 10340, 10901, 19820, 20680, 21802, 39640, 43604, 46577, 54505, 87208, 93154, 109010, 186308, 218020, 232885, 372616, 436040, 465770, 512347, 931540, 1024694, 1863080, 2049388, 2561735, 4098776, 5123470, 10246940, 20493880]

約数ペア:

[(1, 20493880), (2, 10246940), (4, 5123470), (5, 4098776), (8, 2561735), (10, 2049388), (11, 1863080), (20, 1024694), (22, 931540), (40, 512347), (44, 465770), (47, 436040), (55, 372616), (88, 232885), (94, 218020), (110, 186308), (188, 109010), (220, 93154), (235, 87208), (376, 54505), (440, 46577), (470, 43604), (517, 39640), (940, 21802), (991, 20680), (1034, 19820), (1880, 10901), (1982, 10340), (2068, 9910), (2585, 7928), (3964, 5170), (4136, 4955)]