20919076271 has 4 divisors (see below), whose sum is σ = 20919816672. Its totient is φ = 20918335872.

The previous prime is 20919076261. The next prime is 20919076313. The reversal of 20919076271 is 17267091902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20919076271 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 (20919076201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326066 + ... + 384911.

It is an arithmetic number, because the mean of its divisors is an integer number (5229954168).

Almost surely, 2^20919076271 is an apocalyptic number.

20919076271 is a deficient number, since it is larger than the sum of its proper divisors (740401).

20919076271 is an equidigital number, since it uses as much as digits as its factorization.

20919076271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740400.

The product of its (nonzero) digits is 95256, while the sum is 44.

The spelling of 20919076271 in words is "twenty billion, nine hundred nineteen million, seventy-six thousand, two hundred seventy-one".