20851134 has 16 divisors (see below), whose sum is σ = 41756688. Its totient is φ = 6941312.

The previous prime is 20851109. The next prime is 20851211. The reversal of 20851134 is 43115802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4084 + ... + 7640.

It is an arithmetic number, because the mean of its divisors is an integer number (2609793).

Almost surely, 2^20851134 is an apocalyptic number.

20851134 is an abundant number, since it is smaller than the sum of its proper divisors (20905554).

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

20851134 is a wasteful number, since it uses less digits than its factorization.

20851134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4539.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 20851134 is about 4566.3041948604. The cubic root of 20851134 is about 275.2389504400.

Adding to 20851134 its reverse (43115802), we get a palindrome (63966936).

The spelling of 20851134 in words is "twenty million, eight hundred fifty-one thousand, one hundred thirty-four".