20871696 has 20 divisors (see below), whose sum is σ = 53918672. Its totient is φ = 6957216.

The previous prime is 20871691. The next prime is 20871707. The reversal of 20871696 is 69617802.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20871691) 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, 217366 + ... + 217461.

Almost surely, 2^20871696 is an apocalyptic number.

It is an amenable number.

20871696 is an abundant number, since it is smaller than the sum of its proper divisors (33046976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20871696 is a wasteful number, since it uses less digits than its factorization.

20871696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434838 (or 434832 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 20871696 is about 4568.5551326431. Note that the first 3 decimals coincide. The cubic root of 20871696 is about 275.3293948252.

The spelling of 20871696 in words is "twenty million, eight hundred seventy-one thousand, six hundred ninety-six".