21178390

素因数分解:

$2^1\times 5^1\times {\mathrm{571}}^1\times {\mathrm{3709}}^1$

素因数の和:4287

約数の個数: 16

約数和(自身を含む): 38198160

約数和(自身を除く): 17019770

約数列:

[1, 2, 5, 10, 571, 1142, 2855, 3709, 5710, 7418, 18545, 37090, 2117839, 4235678, 10589195, 21178390]

約数ペア:

[(1, 21178390), (2, 10589195), (5, 4235678), (10, 2117839), (571, 37090), (1142, 18545), (2855, 7418), (3709, 5710)]