20772457751 has 8 divisors (see below), whose sum is σ = 22204282464. Its totient is φ = 19384689280.

The previous prime is 20772457747. The next prime is 20772457757. The reversal of 20772457751 is 15775427702.

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 20772457751 - 2² = 20772457747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20772457696 and 20772457705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20772457757) 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, 11013086 + ... + 11014971.

It is an arithmetic number, because the mean of its divisors is an integer number (2775535308).

Almost surely, 2^20772457751 is an apocalyptic number.

20772457751 is a deficient number, since it is larger than the sum of its proper divisors (1431824713).

20772457751 is a wasteful number, since it uses less digits than its factorization.

20772457751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22028121.

The product of its (nonzero) digits is 960400, while the sum is 47.

The spelling of 20772457751 in words is "twenty billion, seven hundred seventy-two million, four hundred fifty-seven thousand, seven hundred fifty-one".