20016813 has 8 divisors (see below), whose sum is σ = 26824000. Its totient is φ = 13277088.

The previous prime is 20016791. The next prime is 20016827. The reversal of 20016813 is 31861002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20016813 - 2⁵ = 20016781 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20016813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20016833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16168 + ... + 17361.

It is an arithmetic number, because the mean of its divisors is an integer number (3353000).

Almost surely, 2^20016813 is an apocalyptic number.

It is an amenable number.

20016813 is a deficient number, since it is larger than the sum of its proper divisors (6807187).

20016813 is a wasteful number, since it uses less digits than its factorization.

20016813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33731.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 20016813 is about 4474.0153106578. The cubic root of 20016813 is about 271.5178028611.

Adding to 20016813 its reverse (31861002), we get a palindrome (51877815).

The spelling of 20016813 in words is "twenty million, sixteen thousand, eight hundred thirteen".