18669520

素因数分解:

$2^4\times 5^1\times {\mathrm{109}}^1\times {\mathrm{2141}}^1$

素因数の和:2263

約数の個数: 40

約数和(自身を含む): 43825320

約数和(自身を除く): 25155800

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 109, 218, 436, 545, 872, 1090, 1744, 2141, 2180, 4282, 4360, 8564, 8720, 10705, 17128, 21410, 34256, 42820, 85640, 171280, 233369, 466738, 933476, 1166845, 1866952, 2333690, 3733904, 4667380, 9334760, 18669520]

約数ペア:

[(1, 18669520), (2, 9334760), (4, 4667380), (5, 3733904), (8, 2333690), (10, 1866952), (16, 1166845), (20, 933476), (40, 466738), (80, 233369), (109, 171280), (218, 85640), (436, 42820), (545, 34256), (872, 21410), (1090, 17128), (1744, 10705), (2141, 8720), (2180, 8564), (4282, 4360)]