20837173287 has 16 divisors (see below), whose sum is σ = 31755261440. Its totient is φ = 11905689312.

The previous prime is 20837173283. The next prime is 20837173303. The reversal of 20837173287 is 78237173802.

It is a happy number.

It is not a de Polignac number, because 20837173287 - 2² = 20837173283 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20837173283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171438 + ... + 266580.

It is an arithmetic number, because the mean of its divisors is an integer number (1984703840).

Almost surely, 2^20837173287 is an apocalyptic number.

20837173287 is a deficient number, since it is larger than the sum of its proper divisors (10918088153).

20837173287 is a wasteful number, since it uses less digits than its factorization.

20837173287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105582.

The product of its (nonzero) digits is 790272, while the sum is 48.

The spelling of 20837173287 in words is "twenty billion, eight hundred thirty-seven million, one hundred seventy-three thousand, two hundred eighty-seven".