20239521 has 8 divisors (see below), whose sum is σ = 27092064. Its totient is φ = 13440000.

The previous prime is 20239507. The next prime is 20239523. The reversal of 20239521 is 12593202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20239521 - 2²³ = 11850913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20239491 and 20239500.

It is not an unprimeable number, because it can be changed into a prime (20239523) 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 7 ways as a sum of consecutive naturals, for example, 12355 + ... + 13896.

It is an arithmetic number, because the mean of its divisors is an integer number (3386508).

Almost surely, 2^20239521 is an apocalyptic number.

It is an amenable number.

20239521 is a deficient number, since it is larger than the sum of its proper divisors (6852543).

20239521 is a wasteful number, since it uses less digits than its factorization.

20239521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26511.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20239521 is about 4498.8355159974. The cubic root of 20239521 is about 272.5210644996.

The spelling of 20239521 in words is "twenty million, two hundred thirty-nine thousand, five hundred twenty-one".