21023920

素因数分解:

$2^4\times 5^1\times {\mathrm{109}}^1\times {\mathrm{2411}}^1$

素因数の和:2533

約数の個数: 40

約数和(自身を含む): 49349520

約数和(自身を除く): 28325600

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 109, 218, 436, 545, 872, 1090, 1744, 2180, 2411, 4360, 4822, 8720, 9644, 12055, 19288, 24110, 38576, 48220, 96440, 192880, 262799, 525598, 1051196, 1313995, 2102392, 2627990, 4204784, 5255980, 10511960, 21023920]

約数ペア:

[(1, 21023920), (2, 10511960), (4, 5255980), (5, 4204784), (8, 2627990), (10, 2102392), (16, 1313995), (20, 1051196), (40, 525598), (80, 262799), (109, 192880), (218, 96440), (436, 48220), (545, 38576), (872, 24110), (1090, 19288), (1744, 12055), (2180, 9644), (2411, 8720), (4360, 4822)]