20135688 has 32 divisors (see below), whose sum is σ = 50816160. Its totient is φ = 6648320.

The previous prime is 20135683. The next prime is 20135737. The reversal of 20135688 is 88653102.

It is a happy number.

It is a hoax number, since the sum of its digits (33) 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 (20135681) 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, 1353 + ... + 6488.

It is an arithmetic number, because the mean of its divisors is an integer number (1588005).

Almost surely, 2^20135688 is an apocalyptic number.

It is an amenable number.

20135688 is an abundant number, since it is smaller than the sum of its proper divisors (30680472).

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

20135688 is a wasteful number, since it uses less digits than its factorization.

20135688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7957 (or 7953 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 20135688 is about 4487.2806910199. The cubic root of 20135688 is about 272.0542351482.

The spelling of 20135688 in words is "twenty million, one hundred thirty-five thousand, six hundred eighty-eight".