21780040

素因数分解:

$2^3\times 5^1\times {\mathrm{544501}}^1$

素因数の和:544512

約数の個数: 16

約数和(自身を含む): 49005180

約数和(自身を除く): 27225140

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 544501, 1089002, 2178004, 2722505, 4356008, 5445010, 10890020, 21780040]

約数ペア:

[(1, 21780040), (2, 10890020), (4, 5445010), (5, 4356008), (8, 2722505), (10, 2178004), (20, 1089002), (40, 544501)]