20430722671 has 4 divisors (see below), whose sum is σ = 20431213000. Its totient is φ = 20430232344.

The previous prime is 20430722597. The next prime is 20430722677. The reversal of 20430722671 is 17622703402.

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 20430722671 - 2²³ = 20422334063 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 (20430722677) 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, 176196 + ... + 268153.

It is an arithmetic number, because the mean of its divisors is an integer number (5107803250).

Almost surely, 2^20430722671 is an apocalyptic number.

20430722671 is a deficient number, since it is larger than the sum of its proper divisors (490329).

20430722671 is an equidigital number, since it uses as much as digits as its factorization.

20430722671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490328.

The product of its (nonzero) digits is 28224, while the sum is 34.

The spelling of 20430722671 in words is "twenty billion, four hundred thirty million, seven hundred twenty-two thousand, six hundred seventy-one".