20288239441 has 4 divisors (see below), whose sum is σ = 21170336832. Its totient is φ = 19406142052.

The previous prime is 20288239397. The next prime is 20288239451. The reversal of 20288239441 is 14493288202.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20288239441 is a prime.

It is a super-2 number, since 2×20288239441² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20288239451) 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 3 ways as a sum of consecutive naturals, for example, 441048661 + ... + 441048706.

It is an arithmetic number, because the mean of its divisors is an integer number (5292584208).

Almost surely, 2^20288239441 is an apocalyptic number.

It is an amenable number.

20288239441 is a deficient number, since it is larger than the sum of its proper divisors (882097391).

20288239441 is an equidigital number, since it uses as much as digits as its factorization.

20288239441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882097390.

The product of its (nonzero) digits is 221184, while the sum is 43.

The spelling of 20288239441 in words is "twenty billion, two hundred eighty-eight million, two hundred thirty-nine thousand, four hundred forty-one".