20788013 has 2 divisors, whose sum is σ = 20788014. Its totient is φ = 20788012.

The previous prime is 20788003. The next prime is 20788037. The reversal of 20788013 is 31088702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12482089 + 8305924 = 3533^2 + 2882^2 .

It is a cyclic number.

It is not a de Polignac number, because 20788013 - 2⁸ = 20787757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20788003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10394006 + 10394007.

It is an arithmetic number, because the mean of its divisors is an integer number (10394007).

Almost surely, 2^20788013 is an apocalyptic number.

It is an amenable number.

20788013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20788013 is an equidigital number, since it uses as much as digits as its factorization.

20788013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 20788013 is about 4559.3873491951. The cubic root of 20788013 is about 274.9609332934.

The spelling of 20788013 in words is "twenty million, seven hundred eighty-eight thousand, thirteen".