20451722194 has 32 divisors (see below), whose sum is σ = 33989400576. Its totient is φ = 9186255360.

The previous prime is 20451722167. The next prime is 20451722197. The reversal of 20451722194 is 49122715402.

It is not an unprimeable number, because it can be changed into a prime (20451722197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55962 + ... + 209845.

It is an arithmetic number, because the mean of its divisors is an integer number (1062168768).

Almost surely, 2^20451722194 is an apocalyptic number.

20451722194 is a deficient number, since it is larger than the sum of its proper divisors (13537678382).

20451722194 is a wasteful number, since it uses less digits than its factorization.

20451722194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265930.

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 20451722194 in words is "twenty billion, four hundred fifty-one million, seven hundred twenty-two thousand, one hundred ninety-four".