20425051 has 4 divisors (see below), whose sum is σ = 20475400. Its totient is φ = 20374704.

The previous prime is 20425049. The next prime is 20425091. The reversal of 20425051 is 15052402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15052402 = 2 ⋅7526201.

It is a cyclic number.

It is not a de Polignac number, because 20425051 - 2¹ = 20425049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20425021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24561 + ... + 25378.

It is an arithmetic number, because the mean of its divisors is an integer number (5118850).

Almost surely, 2^20425051 is an apocalyptic number.

20425051 is a deficient number, since it is larger than the sum of its proper divisors (50349).

20425051 is an equidigital number, since it uses as much as digits as its factorization.

20425051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50348.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 20425051 is about 4519.4082577258. The cubic root of 20425051 is about 273.3512409776.

Adding to 20425051 its reverse (15052402), we get a palindrome (35477453).

The spelling of 20425051 in words is "twenty million, four hundred twenty-five thousand, fifty-one".