20539238 has 4 divisors (see below), whose sum is σ = 30808860. Its totient is φ = 10269618.

The previous prime is 20539223. The next prime is 20539241. The reversal of 20539238 is 83293502.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5134808 + ... + 5134811.

It is an arithmetic number, because the mean of its divisors is an integer number (7702215).

Almost surely, 2^20539238 is an apocalyptic number.

20539238 is a deficient number, since it is larger than the sum of its proper divisors (10269622).

20539238 is a wasteful number, since it uses less digits than its factorization.

20539238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10269621.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 20539238 is about 4532.0236098238. The cubic root of 20539238 is about 273.8596880480.

The spelling of 20539238 in words is "twenty million, five hundred thirty-nine thousand, two hundred thirty-eight".