20858731773 has 12 divisors (see below), whose sum is σ = 30569822304. Its totient is φ = 12641655400.

The previous prime is 20858731769. The next prime is 20858731783. The reversal of 20858731773 is 37713785802.

It is not a de Polignac number, because 20858731773 - 2² = 20858731769 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20858731783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28730673 + ... + 28731398.

It is an arithmetic number, because the mean of its divisors is an integer number (2547485192).

Almost surely, 2^20858731773 is an apocalyptic number.

It is an amenable number.

20858731773 is a deficient number, since it is larger than the sum of its proper divisors (9711090531).

20858731773 is a wasteful number, since it uses less digits than its factorization.

20858731773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57462096 (or 57462085 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 51.

The spelling of 20858731773 in words is "twenty billion, eight hundred fifty-eight million, seven hundred thirty-one thousand, seven hundred seventy-three".