20525506 has 4 divisors (see below), whose sum is σ = 30788262. Its totient is φ = 10262752.

The previous prime is 20525501. The next prime is 20525521. The reversal of 20525506 is 60552502.

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., 19404025 + 1121481 = 4405^2 + 1059^2 .

It is not an unprimeable number, because it can be changed into a prime (20525501) 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 as a sum of consecutive naturals, namely, 5131375 + ... + 5131378.

Almost surely, 2^20525506 is an apocalyptic number.

20525506 is a deficient number, since it is larger than the sum of its proper divisors (10262756).

20525506 is a wasteful number, since it uses less digits than its factorization.

20525506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10262755.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 20525506 is about 4530.5083599967. The cubic root of 20525506 is about 273.7986426214.

The spelling of 20525506 in words is "twenty million, five hundred twenty-five thousand, five hundred six".