19978390

素因数分解:

$2^1\times 5^1\times {\mathrm{29}}^1\times {\mathrm{68891}}^1$

素因数の和:68927

約数の個数: 16

約数和(自身を含む): 37201680

約数和(自身を除く): 17223290

約数列:

[1, 2, 5, 10, 29, 58, 145, 290, 68891, 137782, 344455, 688910, 1997839, 3995678, 9989195, 19978390]

約数ペア:

[(1, 19978390), (2, 9989195), (5, 3995678), (10, 1997839), (29, 688910), (58, 344455), (145, 137782), (290, 68891)]