20772322257 has 8 divisors (see below), whose sum is σ = 27970652160. Its totient is φ = 13711103600.

The previous prime is 20772322243. The next prime is 20772322273. The reversal of 20772322257 is 75222327702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20772322257 - 2⁸ = 20772322001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20772322237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34277457 + ... + 34278062.

It is an arithmetic number, because the mean of its divisors is an integer number (3496331520).

Almost surely, 2^20772322257 is an apocalyptic number.

It is an amenable number.

20772322257 is a deficient number, since it is larger than the sum of its proper divisors (7198329903).

20772322257 is a wasteful number, since it uses less digits than its factorization.

20772322257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68555623.

The product of its (nonzero) digits is 164640, while the sum is 39.

Adding to 20772322257 its reverse (75222327702), we get a palindrome (95994649959).

Subtracting 20772322257 from its reverse (75222327702), we obtain a palindrome (54450005445).

The spelling of 20772322257 in words is "twenty billion, seven hundred seventy-two million, three hundred twenty-two thousand, two hundred fifty-seven".