21377480

素因数分解:

$2^3\times 5^1\times {\mathrm{47}}^1\times {\mathrm{83}}^1\times {\mathrm{137}}^1$

素因数の和:278

約数の個数: 64

約数和(自身を含む): 50077440

約数和(自身を除く): 28699960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 47, 83, 94, 137, 166, 188, 235, 274, 332, 376, 415, 470, 548, 664, 685, 830, 940, 1096, 1370, 1660, 1880, 2740, 3320, 3901, 5480, 6439, 7802, 11371, 12878, 15604, 19505, 22742, 25756, 31208, 32195, 39010, 45484, 51512, 56855, 64390, 78020, 90968, 113710, 128780, 156040, 227420, 257560, 454840, 534437, 1068874, 2137748, 2672185, 4275496, 5344370, 10688740, 21377480]

約数ペア:

[(1, 21377480), (2, 10688740), (4, 5344370), (5, 4275496), (8, 2672185), (10, 2137748), (20, 1068874), (40, 534437), (47, 454840), (83, 257560), (94, 227420), (137, 156040), (166, 128780), (188, 113710), (235, 90968), (274, 78020), (332, 64390), (376, 56855), (415, 51512), (470, 45484), (548, 39010), (664, 32195), (685, 31208), (830, 25756), (940, 22742), (1096, 19505), (1370, 15604), (1660, 12878), (1880, 11371), (2740, 7802), (3320, 6439), (3901, 5480)]