21408560

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1\times {\mathrm{107}}^1$

素因数の和:222

約数の個数: 80

約数和(自身を含む): 52309152

約数和(自身を除く): 30900592

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 61, 80, 82, 107, 122, 164, 205, 214, 244, 305, 328, 410, 428, 488, 535, 610, 656, 820, 856, 976, 1070, 1220, 1640, 1712, 2140, 2440, 2501, 3280, 4280, 4387, 4880, 5002, 6527, 8560, 8774, 10004, 12505, 13054, 17548, 20008, 21935, 25010, 26108, 32635, 35096, 40016, 43870, 50020, 52216, 65270, 70192, 87740, 100040, 104432, 130540, 175480, 200080, 261080, 267607, 350960, 522160, 535214, 1070428, 1338035, 2140856, 2676070, 4281712, 5352140, 10704280, 21408560]

約数ペア:

[(1, 21408560), (2, 10704280), (4, 5352140), (5, 4281712), (8, 2676070), (10, 2140856), (16, 1338035), (20, 1070428), (40, 535214), (41, 522160), (61, 350960), (80, 267607), (82, 261080), (107, 200080), (122, 175480), (164, 130540), (205, 104432), (214, 100040), (244, 87740), (305, 70192), (328, 65270), (410, 52216), (428, 50020), (488, 43870), (535, 40016), (610, 35096), (656, 32635), (820, 26108), (856, 25010), (976, 21935), (1070, 20008), (1220, 17548), (1640, 13054), (1712, 12505), (2140, 10004), (2440, 8774), (2501, 8560), (3280, 6527), (4280, 5002), (4387, 4880)]