20387123 has 2 divisors, whose sum is σ = 20387124. Its totient is φ = 20387122.

The previous prime is 20387113. The next prime is 20387167. The reversal of 20387123 is 32178302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20387123 - 2¹⁰ = 20386099 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20387092 and 20387101.

It is not a weakly prime, because it can be changed into another prime (20387113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10193561 + 10193562.

It is an arithmetic number, because the mean of its divisors is an integer number (10193562).

Almost surely, 2^20387123 is an apocalyptic number.

20387123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20387123 is an equidigital number, since it uses as much as digits as its factorization.

20387123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20387123 is about 4515.2101833691. The cubic root of 20387123 is about 273.1819376083.

The spelling of 20387123 in words is "twenty million, three hundred eighty-seven thousand, one hundred twenty-three".