20773737391 has 16 divisors (see below), whose sum is σ = 23484423168. Its totient is φ = 18204825600.

The previous prime is 20773737373. The next prime is 20773737407. The reversal of 20773737391 is 19373737702.

It is a cyclic number.

It is not a de Polignac number, because 20773737391 - 2⁷ = 20773737263 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 (20773707391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30885 + ... + 206158.

It is an arithmetic number, because the mean of its divisors is an integer number (1467776448).

Almost surely, 2^20773737391 is an apocalyptic number.

20773737391 is a deficient number, since it is larger than the sum of its proper divisors (2710685777).

20773737391 is a wasteful number, since it uses less digits than its factorization.

20773737391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237342.

The product of its (nonzero) digits is 1166886, while the sum is 49.

The spelling of 20773737391 in words is "twenty billion, seven hundred seventy-three million, seven hundred thirty-seven thousand, three hundred ninety-one".