21280720

素因数分解:

$2^4\times 5^1\times {\mathrm{266009}}^1$

素因数の和:266022

約数の個数: 20

約数和(自身を含む): 49477860

約数和(自身を除く): 28197140

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266009, 532018, 1064036, 1330045, 2128072, 2660090, 4256144, 5320180, 10640360, 21280720]

約数ペア:

[(1, 21280720), (2, 10640360), (4, 5320180), (5, 4256144), (8, 2660090), (10, 2128072), (16, 1330045), (20, 1064036), (40, 532018), (80, 266009)]