19888880

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{97}}^1\times {\mathrm{233}}^1$

素因数の和:354

約数の個数: 80

約数和(自身を含む): 51184224

約数和(自身を除く): 31295344

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 80, 88, 97, 110, 176, 194, 220, 233, 388, 440, 466, 485, 776, 880, 932, 970, 1067, 1165, 1552, 1864, 1940, 2134, 2330, 2563, 3728, 3880, 4268, 4660, 5126, 5335, 7760, 8536, 9320, 10252, 10670, 12815, 17072, 18640, 20504, 21340, 22601, 25630, 41008, 42680, 45202, 51260, 85360, 90404, 102520, 113005, 180808, 205040, 226010, 248611, 361616, 452020, 497222, 904040, 994444, 1243055, 1808080, 1988888, 2486110, 3977776, 4972220, 9944440, 19888880]

約数ペア:

[(1, 19888880), (2, 9944440), (4, 4972220), (5, 3977776), (8, 2486110), (10, 1988888), (11, 1808080), (16, 1243055), (20, 994444), (22, 904040), (40, 497222), (44, 452020), (55, 361616), (80, 248611), (88, 226010), (97, 205040), (110, 180808), (176, 113005), (194, 102520), (220, 90404), (233, 85360), (388, 51260), (440, 45202), (466, 42680), (485, 41008), (776, 25630), (880, 22601), (932, 21340), (970, 20504), (1067, 18640), (1165, 17072), (1552, 12815), (1864, 10670), (1940, 10252), (2134, 9320), (2330, 8536), (2563, 7760), (3728, 5335), (3880, 5126), (4268, 4660)]