20921945

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{20021}}^1$

素因数の和:20056

約数の個数: 16

約数和(自身を含む): 28831680

約数和(自身を除く): 7909735

約数列:

[1, 5, 11, 19, 55, 95, 209, 1045, 20021, 100105, 220231, 380399, 1101155, 1901995, 4184389, 20921945]

約数ペア:

[(1, 20921945), (5, 4184389), (11, 1901995), (19, 1101155), (55, 380399), (95, 220231), (209, 100105), (1045, 20021)]