20638640

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{47}}^1\times {\mathrm{499}}^1$

素因数の和:570

約数の個数: 80

約数和(自身を含む): 53568000

約数和(自身を除く): 32929360

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 47, 55, 80, 88, 94, 110, 176, 188, 220, 235, 376, 440, 470, 499, 517, 752, 880, 940, 998, 1034, 1880, 1996, 2068, 2495, 2585, 3760, 3992, 4136, 4990, 5170, 5489, 7984, 8272, 9980, 10340, 10978, 19960, 20680, 21956, 23453, 27445, 39920, 41360, 43912, 46906, 54890, 87824, 93812, 109780, 117265, 187624, 219560, 234530, 257983, 375248, 439120, 469060, 515966, 938120, 1031932, 1289915, 1876240, 2063864, 2579830, 4127728, 5159660, 10319320, 20638640]

約数ペア:

[(1, 20638640), (2, 10319320), (4, 5159660), (5, 4127728), (8, 2579830), (10, 2063864), (11, 1876240), (16, 1289915), (20, 1031932), (22, 938120), (40, 515966), (44, 469060), (47, 439120), (55, 375248), (80, 257983), (88, 234530), (94, 219560), (110, 187624), (176, 117265), (188, 109780), (220, 93812), (235, 87824), (376, 54890), (440, 46906), (470, 43912), (499, 41360), (517, 39920), (752, 27445), (880, 23453), (940, 21956), (998, 20680), (1034, 19960), (1880, 10978), (1996, 10340), (2068, 9980), (2495, 8272), (2585, 7984), (3760, 5489), (3992, 5170), (4136, 4990)]