20768871 has 16 divisors (see below), whose sum is σ = 28575360. Its totient is φ = 13409760.

The previous prime is 20768851. The next prime is 20768873. The reversal of 20768871 is 17886702.

It is not a de Polignac number, because 20768871 - 2¹⁰ = 20767847 is a prime.

It is a super-2 number, since 2×20768871² = 862692005229282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20768873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16285 + ... + 17513.

It is an arithmetic number, because the mean of its divisors is an integer number (1785960).

Almost surely, 2^20768871 is an apocalyptic number.

20768871 is a deficient number, since it is larger than the sum of its proper divisors (7806489).

20768871 is a wasteful number, since it uses less digits than its factorization.

20768871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406.

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 20768871 is about 4557.2876801887. The cubic root of 20768871 is about 274.8765109466.

The spelling of 20768871 in words is "twenty million, seven hundred sixty-eight thousand, eight hundred seventy-one".