20319280

素因数分解:

$2^4\times 5^1\times {\mathrm{499}}^1\times {\mathrm{509}}^1$

素因数の和:1021

約数の個数: 40

約数和(自身を含む): 47430000

約数和(自身を除く): 27110720

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 499, 509, 998, 1018, 1996, 2036, 2495, 2545, 3992, 4072, 4990, 5090, 7984, 8144, 9980, 10180, 19960, 20360, 39920, 40720, 253991, 507982, 1015964, 1269955, 2031928, 2539910, 4063856, 5079820, 10159640, 20319280]

約数ペア:

[(1, 20319280), (2, 10159640), (4, 5079820), (5, 4063856), (8, 2539910), (10, 2031928), (16, 1269955), (20, 1015964), (40, 507982), (80, 253991), (499, 40720), (509, 39920), (998, 20360), (1018, 19960), (1996, 10180), (2036, 9980), (2495, 8144), (2545, 7984), (3992, 5090), (4072, 4990)]