20525579 has 4 divisors (see below), whose sum is σ = 21732984. Its totient is φ = 19318176.

The previous prime is 20525573. The next prime is 20525587. The reversal of 20525579 is 97552502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97552502 = 2 ⋅48776251.

It is a cyclic number.

It is not a de Polignac number, because 20525579 - 2⁴ = 20525563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20525573) 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, 603677 + ... + 603710.

It is an arithmetic number, because the mean of its divisors is an integer number (5433246).

Almost surely, 2^20525579 is an apocalyptic number.

20525579 is a deficient number, since it is larger than the sum of its proper divisors (1207405).

20525579 is a wasteful number, since it uses less digits than its factorization.

20525579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1207404.

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 20525579 is about 4530.5164164806. The cubic root of 20525579 is about 273.7989672140.

The spelling of 20525579 in words is "twenty million, five hundred twenty-five thousand, five hundred seventy-nine".