20442242431 has 8 divisors (see below), whose sum is σ = 22017836960. Its totient is φ = 18867092832.

The previous prime is 20442242417. The next prime is 20442242449. The reversal of 20442242431 is 13424224402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20442242431 - 2¹⁵ = 20442209663 is a prime.

It is a super-2 number, since 2×20442242431² (a number of 21 digits) contains 22 as substring.

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 20442242431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20442242131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12555 + ... + 202588.

It is an arithmetic number, because the mean of its divisors is an integer number (2752229620).

Almost surely, 2^20442242431 is an apocalyptic number.

20442242431 is a deficient number, since it is larger than the sum of its proper divisors (1575594529).

20442242431 is a wasteful number, since it uses less digits than its factorization.

20442242431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222465.

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 20442242431 its reverse (13424224402), we get a palindrome (33866466833).

The spelling of 20442242431 in words is "twenty billion, four hundred forty-two million, two hundred forty-two thousand, four hundred thirty-one".