20512423 has 8 divisors (see below), whose sum is σ = 21072240. Its totient is φ = 19955520.

The previous prime is 20512411. The next prime is 20512433. The reversal of 20512423 is 32421502.

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

It is not a de Polignac number, because 20512423 - 2⁵ = 20512391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20512423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20512403) 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, 27388 + ... + 28126.

It is an arithmetic number, because the mean of its divisors is an integer number (2634030).

Almost surely, 2^20512423 is an apocalyptic number.

20512423 is a deficient number, since it is larger than the sum of its proper divisors (559817).

20512423 is an equidigital number, since it uses as much as digits as its factorization.

20512423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20512423 is about 4529.0642521386. The cubic root of 20512423 is about 273.7404569833.

Adding to 20512423 its reverse (32421502), we get a palindrome (52933925).

The spelling of 20512423 in words is "twenty million, five hundred twelve thousand, four hundred twenty-three".