18910540

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{1999}}^1$

素因数の和:2062

約数の個数: 48

約数和(自身を含む): 44352000

約数和(自身を除く): 25441460

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 43, 44, 55, 86, 110, 172, 215, 220, 430, 473, 860, 946, 1892, 1999, 2365, 3998, 4730, 7996, 9460, 9995, 19990, 21989, 39980, 43978, 85957, 87956, 109945, 171914, 219890, 343828, 429785, 439780, 859570, 945527, 1719140, 1891054, 3782108, 4727635, 9455270, 18910540]

約数ペア:

[(1, 18910540), (2, 9455270), (4, 4727635), (5, 3782108), (10, 1891054), (11, 1719140), (20, 945527), (22, 859570), (43, 439780), (44, 429785), (55, 343828), (86, 219890), (110, 171914), (172, 109945), (215, 87956), (220, 85957), (430, 43978), (473, 39980), (860, 21989), (946, 19990), (1892, 9995), (1999, 9460), (2365, 7996), (3998, 4730)]