20287223219231 has 4 divisors (see below), whose sum is σ = 20287244299872. Its totient is φ = 20287202138592.

The previous prime is 20287223219209. The next prime is 20287223219233. The reversal of 20287223219231 is 13291232278202.

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 20287223219231 - 2¹⁸ = 20287222957087 is a prime.

It is a super-2 number, since 2×20287223219231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20287223219233) 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, 9024071 + ... + 11045736.

It is an arithmetic number, because the mean of its divisors is an integer number (5071811074968).

Almost surely, 2^{20287223219231} is an apocalyptic number.

20287223219231 is a deficient number, since it is larger than the sum of its proper divisors (21080641).

20287223219231 is a wasteful number, since it uses less digits than its factorization.

20287223219231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21080640.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 20287223219231 in words is "twenty trillion, two hundred eighty-seven billion, two hundred twenty-three million, two hundred nineteen thousand, two hundred thirty-one".