19511981

素因数分解:

${\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{109}}^1\times {\mathrm{181}}^1$

素因数の和:356

約数の個数: 16

約数和(自身を含む): 21141120

約数和(自身を除く): 1629139

約数列:

[1, 23, 43, 109, 181, 989, 2507, 4163, 4687, 7783, 19729, 107801, 179009, 453767, 848347, 19511981]

約数ペア:

[(1, 19511981), (23, 848347), (43, 453767), (109, 179009), (181, 107801), (989, 19729), (2507, 7783), (4163, 4687)]