20678535 has 12 divisors (see below), whose sum is σ = 35842872. Its totient is φ = 11028528.

The previous prime is 20678531. The next prime is 20678549. The reversal of 20678535 is 53587602.

It is not a de Polignac number, because 20678535 - 2² = 20678531 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20678535.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20678531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229717 + ... + 229806.

It is an arithmetic number, because the mean of its divisors is an integer number (2986906).

Almost surely, 2^20678535 is an apocalyptic number.

20678535 is a deficient number, since it is larger than the sum of its proper divisors (15164337).

20678535 is a wasteful number, since it uses less digits than its factorization.

20678535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459534 (or 459531 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 20678535 is about 4547.3657209422. The cubic root of 20678535 is about 274.4773986786.

The spelling of 20678535 in words is "twenty million, six hundred seventy-eight thousand, five hundred thirty-five".