20287120233 has 4 divisors (see below), whose sum is σ = 27049493648. Its totient is φ = 13524746820.

The previous prime is 20287120207. The next prime is 20287120247. The reversal of 20287120233 is 33202178202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20287120233 - 2¹² = 20287116137 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 20287120233.

It is not an unprimeable number, because it can be changed into a prime (20287120253) 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, 3381186703 + ... + 3381186708.

It is an arithmetic number, because the mean of its divisors is an integer number (6762373412).

Almost surely, 2^20287120233 is an apocalyptic number.

It is an amenable number.

20287120233 is a deficient number, since it is larger than the sum of its proper divisors (6762373415).

20287120233 is an equidigital number, since it uses as much as digits as its factorization.

20287120233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6762373414.

The product of its (nonzero) digits is 8064, while the sum is 30.

Adding to 20287120233 its reverse (33202178202), we get a palindrome (53489298435).

The spelling of 20287120233 in words is "twenty billion, two hundred eighty-seven million, one hundred twenty thousand, two hundred thirty-three".