20138768 has 20 divisors (see below), whose sum is σ = 42020748. Its totient is φ = 9294720.

The previous prime is 20138743. The next prime is 20138801. The reversal of 20138768 is 86783102.

It can be written as a sum of positive squares in 2 ways, for example, as 13337104 + 6801664 = 3652^2 + 2608^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48203 + ... + 48618.

Almost surely, 2^20138768 is an apocalyptic number.

It is an amenable number.

20138768 is an abundant number, since it is smaller than the sum of its proper divisors (21881980).

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

20138768 is a wasteful number, since it uses less digits than its factorization.

20138768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96842 (or 96836 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 20138768 is about 4487.6238701567. The cubic root of 20138768 is about 272.0681057830.

The spelling of 20138768 in words is "twenty million, one hundred thirty-eight thousand, seven hundred sixty-eight".