20138502 has 8 divisors (see below), whose sum is σ = 40277016. Its totient is φ = 6712832.

The previous prime is 20138453. The next prime is 20138507. The reversal of 20138502 is 20583102.

It is a sphenic number, since it is the product of 3 distinct primes.

20138502 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20138507) 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, 1678203 + ... + 1678214.

It is an arithmetic number, because the mean of its divisors is an integer number (5034627).

Almost surely, 2^20138502 is an apocalyptic number.

20138502 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20138502 is a wasteful number, since it uses less digits than its factorization.

20138502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3356422.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20138502 is about 4487.5942329939. The cubic root of 20138502 is about 272.0669079204.

The spelling of 20138502 in words is "twenty million, one hundred thirty-eight thousand, five hundred two".