19980040

素因数分解:

$2^3\times 5^1\times {\mathrm{457}}^1\times {\mathrm{1093}}^1$

素因数の和:1561

約数の個数: 32

約数和(自身を含む): 45094680

約数和(自身を除く): 25114640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 457, 914, 1093, 1828, 2186, 2285, 3656, 4372, 4570, 5465, 8744, 9140, 10930, 18280, 21860, 43720, 499501, 999002, 1998004, 2497505, 3996008, 4995010, 9990020, 19980040]

約数ペア:

[(1, 19980040), (2, 9990020), (4, 4995010), (5, 3996008), (8, 2497505), (10, 1998004), (20, 999002), (40, 499501), (457, 43720), (914, 21860), (1093, 18280), (1828, 10930), (2186, 9140), (2285, 8744), (3656, 5465), (4372, 4570)]