20131554005 has 4 divisors (see below), whose sum is σ = 24157864812. Its totient is φ = 16105243200.

The previous prime is 20131553989. The next prime is 20131554007. The reversal of 20131554005 is 50045513102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6799156849 + 13332397156 = 82457^2 + 115466^2 .

It is not a de Polignac number, because 20131554005 - 2⁴ = 20131553989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131554007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2013155396 + ... + 2013155405.

It is an arithmetic number, because the mean of its divisors is an integer number (6039466203).

Almost surely, 2^20131554005 is an apocalyptic number.

It is an amenable number.

20131554005 is a deficient number, since it is larger than the sum of its proper divisors (4026310807).

20131554005 is an equidigital number, since it uses as much as digits as its factorization.

20131554005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4026310806.

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 20131554005 in words is "twenty billion, one hundred thirty-one million, five hundred fifty-four thousand, five".