20787013 has 8 divisors (see below), whose sum is σ = 22450400. Its totient is φ = 19132848.

The previous prime is 20787001. The next prime is 20787023. The reversal of 20787013 is 31078702.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20787013 - 2⁵ = 20786981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20787023) 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, 2818 + ... + 7036.

It is an arithmetic number, because the mean of its divisors is an integer number (2806300).

Almost surely, 2^20787013 is an apocalyptic number.

It is an amenable number.

20787013 is a deficient number, since it is larger than the sum of its proper divisors (1663387).

20787013 is a wasteful number, since it uses less digits than its factorization.

20787013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4611.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 20787013 is about 4559.2776840197. The cubic root of 20787013 is about 274.9565242566.

The spelling of 20787013 in words is "twenty million, seven hundred eighty-seven thousand, thirteen".