20207172143 has 4 divisors (see below), whose sum is σ = 20207626848. Its totient is φ = 20206717440.

The previous prime is 20207172113. The next prime is 20207172149. The reversal of 20207172143 is 34127170202.

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

It is a cyclic number.

It is not a de Polignac number, because 20207172143 - 2²⁴ = 20190394927 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 (20207172149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152471 + ... + 252312.

It is an arithmetic number, because the mean of its divisors is an integer number (5051906712).

Almost surely, 2^20207172143 is an apocalyptic number.

20207172143 is a deficient number, since it is larger than the sum of its proper divisors (454705).

20207172143 is an equidigital number, since it uses as much as digits as its factorization.

20207172143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454704.

The product of its (nonzero) digits is 4704, while the sum is 29.

The spelling of 20207172143 in words is "twenty billion, two hundred seven million, one hundred seventy-two thousand, one hundred forty-three".