20397222389 has 4 divisors (see below), whose sum is σ = 20894715660. Its totient is φ = 19899729120.

The previous prime is 20397222383. The next prime is 20397222401. The reversal of 20397222389 is 98322279302.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7249160164 + 13148062225 = 85142^2 + 114665^2 .

It is a cyclic number.

It is not a de Polignac number, because 20397222389 - 2¹² = 20397218293 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 (20397222383) 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, 248746574 + ... + 248746655.

It is an arithmetic number, because the mean of its divisors is an integer number (5223678915).

Almost surely, 2^20397222389 is an apocalyptic number.

It is an amenable number.

20397222389 is a deficient number, since it is larger than the sum of its proper divisors (497493271).

20397222389 is an equidigital number, since it uses as much as digits as its factorization.

20397222389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497493270.

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 20397222389 in words is "twenty billion, three hundred ninety-seven million, two hundred twenty-two thousand, three hundred eighty-nine".