20930013 has 12 divisors (see below), whose sum is σ = 32557980. Its totient is φ = 12879936.

The previous prime is 20930011. The next prime is 20930033. The reversal of 20930013 is 31003902.

It can be written as a sum of positive squares in 2 ways, for example, as 1375929 + 19554084 = 1173^2 + 4422^2 .

It is not a de Polignac number, because 20930013 - 2¹ = 20930011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20930011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89328 + ... + 89561.

It is an arithmetic number, because the mean of its divisors is an integer number (2713165).

Almost surely, 2^20930013 is an apocalyptic number.

It is an amenable number.

20930013 is a deficient number, since it is larger than the sum of its proper divisors (11627967).

20930013 is a wasteful number, since it uses less digits than its factorization.

20930013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178908 (or 178905 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 20930013 is about 4574.9331142652. The cubic root of 20930013 is about 275.5855863244.

Adding to 20930013 its reverse (31003902), we get a palindrome (51933915).

The spelling of 20930013 in words is "twenty million, nine hundred thirty thousand, thirteen".