20767037687 has 4 divisors (see below), whose sum is σ = 22654950216. Its totient is φ = 18879125160.

The previous prime is 20767037653. The next prime is 20767037699. The reversal of 20767037687 is 78673076702.

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 20767037687 - 2¹² = 20767033591 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 (20767037987) 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 3 ways as a sum of consecutive naturals, for example, 943956248 + ... + 943956269.

It is an arithmetic number, because the mean of its divisors is an integer number (5663737554).

Almost surely, 2^20767037687 is an apocalyptic number.

20767037687 is a deficient number, since it is larger than the sum of its proper divisors (1887912529).

20767037687 is a wasteful number, since it uses less digits than its factorization.

20767037687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1887912528.

The product of its (nonzero) digits is 4148928, while the sum is 53.

The spelling of 20767037687 in words is "twenty billion, seven hundred sixty-seven million, thirty-seven thousand, six hundred eighty-seven".