20152813 has 4 divisors (see below), whose sum is σ = 20170080. Its totient is φ = 20135548.

The previous prime is 20152799. The next prime is 20152819. The reversal of 20152813 is 31825102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20152813 - 2¹⁷ = 20021741 is a prime.

It is a super-2 number, since 2×20152813² = 812271743625938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20152819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6745 + ... + 9262.

It is an arithmetic number, because the mean of its divisors is an integer number (5042520).

Almost surely, 2^20152813 is an apocalyptic number.

It is an amenable number.

20152813 is a deficient number, since it is larger than the sum of its proper divisors (17267).

20152813 is a wasteful number, since it uses less digits than its factorization.

20152813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17266.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 20152813 is about 4489.1884567258. The cubic root of 20152813 is about 272.1313388562.

Adding to 20152813 its reverse (31825102), we get a palindrome (51977915).

The spelling of 20152813 in words is "twenty million, one hundred fifty-two thousand, eight hundred thirteen".