20642013 has 32 divisors (see below), whose sum is σ = 35232000. Its totient is φ = 11700288.

The previous prime is 20642009. The next prime is 20642023. The reversal of 20642013 is 31024602.

It is a happy number.

20642013 is a `hidden beast` number, since 20 + 642 + 0 + 1 + 3 = 666.

It is not a de Polignac number, because 20642013 - 2² = 20642009 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20642023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27795 + ... + 28527.

It is an arithmetic number, because the mean of its divisors is an integer number (1101000).

Almost surely, 2^20642013 is an apocalyptic number.

It is an amenable number.

20642013 is a deficient number, since it is larger than the sum of its proper divisors (14589987).

20642013 is a wasteful number, since it uses less digits than its factorization.

20642013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898 (or 892 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20642013 is about 4543.3482146981. The cubic root of 20642013 is about 274.3157113538.

Adding to 20642013 its reverse (31024602), we get a palindrome (51666615).

The spelling of 20642013 in words is "twenty million, six hundred forty-two thousand, thirteen".