20455013 has 2 divisors, whose sum is σ = 20455014. Its totient is φ = 20455012.

The previous prime is 20455007. The next prime is 20455051. The reversal of 20455013 is 31055402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13235044 + 7219969 = 3638^2 + 2687^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20455013 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20455003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10227506 + 10227507.

It is an arithmetic number, because the mean of its divisors is an integer number (10227507).

Almost surely, 2^20455013 is an apocalyptic number.

It is an amenable number.

20455013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20455013 is an equidigital number, since it uses as much as digits as its factorization.

20455013 is an evil number, because the sum of its binary digits is even.

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

The square root of 20455013 is about 4522.7218574659. The cubic root of 20455013 is about 273.4848375166.

The spelling of 20455013 in words is "twenty million, four hundred fifty-five thousand, thirteen".