20919280

素因数分解:

$2^4\times 5^1\times {\mathrm{109}}^1\times {\mathrm{2399}}^1$

素因数の和:2521

約数の個数: 40

約数和(自身を含む): 49104000

約数和(自身を除く): 28184720

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 109, 218, 436, 545, 872, 1090, 1744, 2180, 2399, 4360, 4798, 8720, 9596, 11995, 19192, 23990, 38384, 47980, 95960, 191920, 261491, 522982, 1045964, 1307455, 2091928, 2614910, 4183856, 5229820, 10459640, 20919280]

約数ペア:

[(1, 20919280), (2, 10459640), (4, 5229820), (5, 4183856), (8, 2614910), (10, 2091928), (16, 1307455), (20, 1045964), (40, 522982), (80, 261491), (109, 191920), (218, 95960), (436, 47980), (545, 38384), (872, 23990), (1090, 19192), (1744, 11995), (2180, 9596), (2399, 8720), (4360, 4798)]