20525473 has 4 divisors (see below), whose sum is σ = 20682288. Its totient is φ = 20368660.

The previous prime is 20525459. The next prime is 20525497. The reversal of 20525473 is 37452502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20525473 - 2⁹ = 20524961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20525413) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 78211 + ... + 78472.

It is an arithmetic number, because the mean of its divisors is an integer number (5170572).

Almost surely, 2^20525473 is an apocalyptic number.

It is an amenable number.

20525473 is a deficient number, since it is larger than the sum of its proper divisors (156815).

20525473 is a wasteful number, since it uses less digits than its factorization.

20525473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156814.

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 20525473 is about 4530.5047180198. The cubic root of 20525473 is about 273.7984958876.

Adding to 20525473 its reverse (37452502), we get a palindrome (57977975).

The spelling of 20525473 in words is "twenty million, five hundred twenty-five thousand, four hundred seventy-three".