20778512 has 20 divisors (see below), whose sum is σ = 41116416. Its totient is φ = 10167840.

The previous prime is 20778493. The next prime is 20778517. The reversal of 20778512 is 21587702.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20778517) 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, 13064 + ... + 14567.

Almost surely, 2^20778512 is an apocalyptic number.

It is an amenable number.

20778512 is a deficient number, since it is larger than the sum of its proper divisors (20337904).

20778512 is a wasteful number, since it uses less digits than its factorization.

20778512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27686 (or 27680 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 20778512 is about 4558.3453138173. The cubic root of 20778512 is about 274.9190373232.

The spelling of 20778512 in words is "twenty million, seven hundred seventy-eight thousand, five hundred twelve".