21076240

素因数分解:

$2^4\times 5^1\times {\mathrm{109}}^1\times {\mathrm{2417}}^1$

素因数の和:2539

約数の個数: 40

約数和(自身を含む): 49472280

約数和(自身を除く): 28396040

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 109, 218, 436, 545, 872, 1090, 1744, 2180, 2417, 4360, 4834, 8720, 9668, 12085, 19336, 24170, 38672, 48340, 96680, 193360, 263453, 526906, 1053812, 1317265, 2107624, 2634530, 4215248, 5269060, 10538120, 21076240]

約数ペア:

[(1, 21076240), (2, 10538120), (4, 5269060), (5, 4215248), (8, 2634530), (10, 2107624), (16, 1317265), (20, 1053812), (40, 526906), (80, 263453), (109, 193360), (218, 96680), (436, 48340), (545, 38672), (872, 24170), (1090, 19336), (1744, 12085), (2180, 9668), (2417, 8720), (4360, 4834)]