20749228279 has 8 divisors (see below), whose sum is σ = 22346624160. Its totient is φ = 19152018336.

The previous prime is 20749228237. The next prime is 20749228289. The reversal of 20749228279 is 97282294702.

It is a happy number.

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 20749228279 - 2⁹ = 20749227767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20749228289) 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, 260337 + ... + 330565.

It is an arithmetic number, because the mean of its divisors is an integer number (2793328020).

Almost surely, 2^20749228279 is an apocalyptic number.

20749228279 is a deficient number, since it is larger than the sum of its proper divisors (1597395881).

20749228279 is a wasteful number, since it uses less digits than its factorization.

20749228279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92969.

The product of its (nonzero) digits is 2032128, while the sum is 52.

The spelling of 20749228279 in words is "twenty billion, seven hundred forty-nine million, two hundred twenty-eight thousand, two hundred seventy-nine".