20643642422 has 16 divisors (see below), whose sum is σ = 33845147952. Its totient is φ = 9385627680.

The previous prime is 20643642421. The next prime is 20643642451. The reversal of 20643642422 is 22424634602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20643642421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5923529 + ... + 5927012.

It is an arithmetic number, because the mean of its divisors is an integer number (2115321747).

Almost surely, 2^20643642422 is an apocalyptic number.

20643642422 is a deficient number, since it is larger than the sum of its proper divisors (13201505530).

20643642422 is a wasteful number, since it uses less digits than its factorization.

20643642422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11850623.

The product of its (nonzero) digits is 110592, while the sum is 35.

The spelling of 20643642422 in words is "twenty billion, six hundred forty-three million, six hundred forty-two thousand, four hundred twenty-two".