20451722292 has 24 divisors (see below), whose sum is σ = 53022984000. Its totient is φ = 6817240728.

The previous prime is 20451722261. The next prime is 20451722293. The reversal of 20451722292 is 29222715402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94683792 + ... + 94684007.

It is an arithmetic number, because the mean of its divisors is an integer number (2209291000).

Almost surely, 2^20451722292 is an apocalyptic number.

It is an amenable number.

20451722292 is an abundant number, since it is smaller than the sum of its proper divisors (32571261708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20451722292 is a wasteful number, since it uses less digits than its factorization.

20451722292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189367812 (or 189367804 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 20451722292 in words is "twenty billion, four hundred fifty-one million, seven hundred twenty-two thousand, two hundred ninety-two".