20816937 has 12 divisors (see below), whose sum is σ = 30117360. Its totient is φ = 13855608.

The previous prime is 20816923. The next prime is 20816953. The reversal of 20816937 is 73961802.

It is not a de Polignac number, because 20816937 - 2¹⁴ = 20800553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20816437) 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, 5614 + ... + 8552.

It is an arithmetic number, because the mean of its divisors is an integer number (2509780).

Almost surely, 2^20816937 is an apocalyptic number.

It is an amenable number.

20816937 is a deficient number, since it is larger than the sum of its proper divisors (9300423).

20816937 is a wasteful number, since it uses less digits than its factorization.

20816937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3732 (or 3729 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 20816937 is about 4562.5581640128. The cubic root of 20816937 is about 275.0883991291.

The spelling of 20816937 in words is "twenty million, eight hundred sixteen thousand, nine hundred thirty-seven".