20768385 has 32 divisors (see below), whose sum is σ = 36495360. Its totient is φ = 10001600.

The previous prime is 20768369. The next prime is 20768393. The reversal of 20768385 is 58386702.

It is not a de Polignac number, because 20768385 - 2⁴ = 20768369 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31186 + ... + 31844.

It is an arithmetic number, because the mean of its divisors is an integer number (1140480).

Almost surely, 2^20768385 is an apocalyptic number.

It is an amenable number.

20768385 is a deficient number, since it is larger than the sum of its proper divisors (15726975).

20768385 is a wasteful number, since it uses less digits than its factorization.

20768385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 20768385 is about 4557.2343586873. The cubic root of 20768385 is about 274.8743668559.

The spelling of 20768385 in words is "twenty million, seven hundred sixty-eight thousand, three hundred eighty-five".