20157044279 has 4 divisors (see below), whose sum is σ = 21342752784. Its totient is φ = 18971335776.

The previous prime is 20157044231. The next prime is 20157044287. The reversal of 20157044279 is 97244075102.

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

It is a de Polignac number, because none of the positive numbers 2^k-20157044279 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 (20157047279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 592854227 + ... + 592854260.

It is an arithmetic number, because the mean of its divisors is an integer number (5335688196).

Almost surely, 2^20157044279 is an apocalyptic number.

20157044279 is a deficient number, since it is larger than the sum of its proper divisors (1185708505).

20157044279 is a wasteful number, since it uses less digits than its factorization.

20157044279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185708504.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 20157044279 in words is "twenty billion, one hundred fifty-seven million, forty-four thousand, two hundred seventy-nine".