20455031 has 4 divisors (see below), whose sum is σ = 20499864. Its totient is φ = 20410200.

The previous prime is 20455013. The next prime is 20455051. The reversal of 20455031 is 13055402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20455031 is a prime.

It is a super-2 number, since 2×20455031² = 836816586421922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20454994 and 20455012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20455051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21725 + ... + 22646.

It is an arithmetic number, because the mean of its divisors is an integer number (5124966).

Almost surely, 2^20455031 is an apocalyptic number.

20455031 is a deficient number, since it is larger than the sum of its proper divisors (44833).

20455031 is an equidigital number, since it uses as much as digits as its factorization.

20455031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44832.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20455031 is about 4522.7238474176. The cubic root of 20455031 is about 273.4849177369.

The spelling of 20455031 in words is "twenty million, four hundred fifty-five thousand, thirty-one".