20424523 has 12 divisors (see below), whose sum is σ = 24000192. Its totient is φ = 17329200.

The previous prime is 20424517. The next prime is 20424533. The reversal of 20424523 is 32542402.

It is not a de Polignac number, because 20424523 - 2⁵ = 20424491 is a prime.

It is a super-2 number, since 2×20424523² = 834322279555058, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20424494 and 20424503.

It is not an unprimeable number, because it can be changed into a prime (20424533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2886 + ... + 7012.

It is an arithmetic number, because the mean of its divisors is an integer number (2000016).

Almost surely, 2^20424523 is an apocalyptic number.

20424523 is a deficient number, since it is larger than the sum of its proper divisors (3575669).

20424523 is a wasteful number, since it uses less digits than its factorization.

20424523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4242 (or 4235 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 20424523 is about 4519.3498426212. The cubic root of 20424523 is about 273.3488855253.

Adding to 20424523 its reverse (32542402), we get a palindrome (52966925).

The spelling of 20424523 in words is "twenty million, four hundred twenty-four thousand, five hundred twenty-three".