20767491371 has 4 divisors (see below), whose sum is σ = 22655445144. Its totient is φ = 18879537600.

The previous prime is 20767491343. The next prime is 20767491373. The reversal of 20767491371 is 17319476702.

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

It is not a de Polignac number, because 20767491371 - 2³⁰ = 19693749547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20767491373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 943976870 + ... + 943976891.

It is an arithmetic number, because the mean of its divisors is an integer number (5663861286).

Almost surely, 2^20767491371 is an apocalyptic number.

20767491371 is a deficient number, since it is larger than the sum of its proper divisors (1887953773).

20767491371 is a wasteful number, since it uses less digits than its factorization.

20767491371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1887953772.

The product of its (nonzero) digits is 444528, while the sum is 47.

The spelling of 20767491371 in words is "twenty billion, seven hundred sixty-seven million, four hundred ninety-one thousand, three hundred seventy-one".