20845238 has 4 divisors (see below), whose sum is σ = 31267860. Its totient is φ = 10422618.

The previous prime is 20845219. The next prime is 20845267. The reversal of 20845238 is 83254802.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5211308 + ... + 5211311.

It is an arithmetic number, because the mean of its divisors is an integer number (7816965).

Almost surely, 2^20845238 is an apocalyptic number.

20845238 is a deficient number, since it is larger than the sum of its proper divisors (10422622).

20845238 is a wasteful number, since it uses less digits than its factorization.

20845238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10422621.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 20845238 is about 4565.6585505270. The cubic root of 20845238 is about 275.2130052191.

The spelling of 20845238 in words is "twenty million, eight hundred forty-five thousand, two hundred thirty-eight".