20451722294 has 4 divisors (see below), whose sum is σ = 30677583444. Its totient is φ = 10225861146.

The previous prime is 20451722293. The next prime is 20451722323. The reversal of 20451722294 is 49222715402.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20451722293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5112930572 + ... + 5112930575.

It is an arithmetic number, because the mean of its divisors is an integer number (7669395861).

Almost surely, 2^20451722294 is an apocalyptic number.

20451722294 is a deficient number, since it is larger than the sum of its proper divisors (10225861150).

20451722294 is a wasteful number, since it uses less digits than its factorization.

20451722294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10225861149.

The product of its (nonzero) digits is 80640, while the sum is 38.

The spelling of 20451722294 in words is "twenty billion, four hundred fifty-one million, seven hundred twenty-two thousand, two hundred ninety-four".