20364642091 has 4 divisors (see below), whose sum is σ = 21562562232. Its totient is φ = 19166721952.

The previous prime is 20364642059. The next prime is 20364642097. The reversal of 20364642091 is 19024646302.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20364642091 - 2⁵ = 20364642059 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20364642091.

It is not an unprimeable number, because it can be changed into a prime (20364642097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 598960045 + ... + 598960078.

It is an arithmetic number, because the mean of its divisors is an integer number (5390640558).

Almost surely, 2^20364642091 is an apocalyptic number.

20364642091 is a deficient number, since it is larger than the sum of its proper divisors (1197920141).

20364642091 is a wasteful number, since it uses less digits than its factorization.

20364642091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197920140.

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 20364642091 in words is "twenty billion, three hundred sixty-four million, six hundred forty-two thousand, ninety-one".