20653816 has 16 divisors (see below), whose sum is σ = 40410000. Its totient is φ = 9877824.

The previous prime is 20653811. The next prime is 20653823. The reversal of 20653816 is 61835602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20653811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55941 + ... + 56308.

It is an arithmetic number, because the mean of its divisors is an integer number (2525625).

Almost surely, 2^20653816 is an apocalyptic number.

It is an amenable number.

20653816 is a deficient number, since it is larger than the sum of its proper divisors (19756184).

20653816 is a wasteful number, since it uses less digits than its factorization.

20653816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112278 (or 112274 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20653816 is about 4544.6469609861. The cubic root of 20653816 is about 274.3679855098.

The spelling of 20653816 in words is "twenty million, six hundred fifty-three thousand, eight hundred sixteen".