20825051 has 24 divisors (see below), whose sum is σ = 24962784. Its totient is φ = 17233920.

The previous prime is 20825047. The next prime is 20825071. The reversal of 20825051 is 15052802.

It is not a de Polignac number, because 20825051 - 2² = 20825047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20825011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86291 + ... + 86531.

It is an arithmetic number, because the mean of its divisors is an integer number (1040116).

Almost surely, 2^20825051 is an apocalyptic number.

20825051 is a deficient number, since it is larger than the sum of its proper divisors (4137733).

20825051 is a wasteful number, since it uses less digits than its factorization.

20825051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 20825051 is about 4563.4472715262. The cubic root of 20825051 is about 275.1241356919.

Adding to 20825051 its reverse (15052802), we get a palindrome (35877853).

The spelling of 20825051 in words is "twenty million, eight hundred twenty-five thousand, fifty-one".