20687620863 has 32 divisors (see below), whose sum is σ = 34049806336. Its totient is φ = 10879723008.

The previous prime is 20687620787. The next prime is 20687620903. The reversal of 20687620863 is 36802678602.

It is a happy number.

It is not a de Polignac number, because 20687620863 - 2¹⁰ = 20687619839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20687620763) 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 31 ways as a sum of consecutive naturals, for example, 20431 + ... + 204432.

It is an arithmetic number, because the mean of its divisors is an integer number (1064056448).

Almost surely, 2^20687620863 is an apocalyptic number.

20687620863 is a deficient number, since it is larger than the sum of its proper divisors (13362185473).

20687620863 is a wasteful number, since it uses less digits than its factorization.

20687620863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225223.

The product of its (nonzero) digits is 1161216, while the sum is 48.

The spelling of 20687620863 in words is "twenty billion, six hundred eighty-seven million, six hundred twenty thousand, eight hundred sixty-three".