20115438423 has 8 divisors (see below), whose sum is σ = 27187990128. Its totient is φ = 13226589504.

The previous prime is 20115438407. The next prime is 20115438449. The reversal of 20115438423 is 32483451102.

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

It is not a de Polignac number, because 20115438423 - 2⁴ = 20115438407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20115438493) 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, 45925440 + ... + 45925877.

It is an arithmetic number, because the mean of its divisors is an integer number (3398498766).

Almost surely, 2^20115438423 is an apocalyptic number.

20115438423 is a deficient number, since it is larger than the sum of its proper divisors (7072551705).

20115438423 is an equidigital number, since it uses as much as digits as its factorization.

20115438423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91851393.

The product of its (nonzero) digits is 23040, while the sum is 33.

Adding to 20115438423 its reverse (32483451102), we get a palindrome (52598889525).

The spelling of 20115438423 in words is "twenty billion, one hundred fifteen million, four hundred thirty-eight thousand, four hundred twenty-three".