20845234 has 4 divisors (see below), whose sum is σ = 31267854. Its totient is φ = 10422616.

The previous prime is 20845219. The next prime is 20845267. The reversal of 20845234 is 43254802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43254802 = 2 ⋅21627401.

It can be written as a sum of positive squares in only one way, i.e., 18275625 + 2569609 = 4275^2 + 1603^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5211307 + ... + 5211310.

Almost surely, 2^20845234 is an apocalyptic number.

20845234 is a deficient number, since it is larger than the sum of its proper divisors (10422620).

20845234 is a wasteful number, since it uses less digits than its factorization.

20845234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10422619.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 20845234 is about 4565.6581124740. The cubic root of 20845234 is about 275.2129876155.

The spelling of 20845234 in words is "twenty million, eight hundred forty-five thousand, two hundred thirty-four".