20749280227 has 4 divisors (see below), whose sum is σ = 22345378720. Its totient is φ = 19153181736.

The previous prime is 20749280213. The next prime is 20749280281. The reversal of 20749280227 is 72208294702.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-20749280227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20749286227) 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 3 ways as a sum of consecutive naturals, for example, 798049227 + ... + 798049252.

It is an arithmetic number, because the mean of its divisors is an integer number (5586344680).

Almost surely, 2^20749280227 is an apocalyptic number.

20749280227 is a deficient number, since it is larger than the sum of its proper divisors (1596098493).

20749280227 is a wasteful number, since it uses less digits than its factorization.

20749280227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596098492.

The product of its (nonzero) digits is 225792, while the sum is 43.

The spelling of 20749280227 in words is "twenty billion, seven hundred forty-nine million, two hundred eighty thousand, two hundred twenty-seven".