20525474 has 4 divisors (see below), whose sum is σ = 30788214. Its totient is φ = 10262736.

The previous prime is 20525459. The next prime is 20525497. The reversal of 20525474 is 47452502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20025625 + 499849 = 4475^2 + 707^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5131367 + ... + 5131370.

Almost surely, 2^20525474 is an apocalyptic number.

20525474 is a deficient number, since it is larger than the sum of its proper divisors (10262740).

20525474 is a wasteful number, since it uses less digits than its factorization.

20525474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10262739.

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 20525474 is about 4530.5048283828. The cubic root of 20525474 is about 273.7985003341.

Adding to 20525474 its reverse (47452502), we get a palindrome (67977976).

The spelling of 20525474 in words is "twenty million, five hundred twenty-five thousand, four hundred seventy-four".