20815896 has 32 divisors (see below), whose sum is σ = 52398000. Its totient is φ = 6890880.

The previous prime is 20815891. The next prime is 20815919. The reversal of 20815896 is 69851802.

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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20815891) 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, 666 + ... + 6486.

Almost surely, 2^20815896 is an apocalyptic number.

It is an amenable number.

20815896 is an abundant number, since it is smaller than the sum of its proper divisors (31582104).

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

20815896 is a wasteful number, since it uses less digits than its factorization.

20815896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5979 (or 5975 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 20815896 is about 4562.4440818491. Note that the first 3 decimals coincide. The cubic root of 20815896 is about 275.0838135714.

The spelling of 20815896 in words is "twenty million, eight hundred fifteen thousand, eight hundred ninety-six".