20765123 has 2 divisors, whose sum is σ = 20765124. Its totient is φ = 20765122.

The previous prime is 20765089. The next prime is 20765137. The reversal of 20765123 is 32156702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20765123 - 2⁸ = 20764867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20765092 and 20765101.

It is not a weakly prime, because it can be changed into another prime (20765153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10382561 + 10382562.

It is an arithmetic number, because the mean of its divisors is an integer number (10382562).

Almost surely, 2^20765123 is an apocalyptic number.

20765123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20765123 is an equidigital number, since it uses as much as digits as its factorization.

20765123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20765123 is about 4556.8764521325. The cubic root of 20765123 is about 274.8599749949.

The spelling of 20765123 in words is "twenty million, seven hundred sixty-five thousand, one hundred twenty-three".