19957990

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{153523}}^1$

素因数の和:153543

約数の個数: 16

約数和(自身を含む): 38688048

約数和(自身を除く): 18730058

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 153523, 307046, 767615, 1535230, 1995799, 3991598, 9978995, 19957990]

約数ペア:

[(1, 19957990), (2, 9978995), (5, 3991598), (10, 1995799), (13, 1535230), (26, 767615), (65, 307046), (130, 153523)]