20404523 has 8 divisors (see below), whose sum is σ = 20979648. Its totient is φ = 19836544.

The previous prime is 20404493. The next prime is 20404547. The reversal of 20404523 is 32540402.

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

It is a cyclic number.

It is not a de Polignac number, because 20404523 - 2²² = 16210219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20404495 and 20404504.

It is not an unprimeable number, because it can be changed into a prime (20404123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4286 + ... + 7692.

It is an arithmetic number, because the mean of its divisors is an integer number (2622456).

Almost surely, 2^20404523 is an apocalyptic number.

20404523 is a deficient number, since it is larger than the sum of its proper divisors (575125).

20404523 is a wasteful number, since it uses less digits than its factorization.

20404523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3573.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20404523 is about 4517.1365930200. The cubic root of 20404523 is about 273.2596339406.

Adding to 20404523 its reverse (32540402), we get a palindrome (52944925).

The spelling of 20404523 in words is "twenty million, four hundred four thousand, five hundred twenty-three".