20431332433 has 4 divisors (see below), whose sum is σ = 20516109988. Its totient is φ = 20346554880.

The previous prime is 20431332431. The next prime is 20431332461. The reversal of 20431332433 is 33423313402.

It is a happy number.

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 18971481169 + 1459851264 = 137737^2 + 38208^2 .

It is a cyclic number.

It is not a de Polignac number, because 20431332433 - 2¹ = 20431332431 is a prime.

It is a super-4 number, since 4×20431332433⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20431332431) 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, 42388416 + ... + 42388897.

It is an arithmetic number, because the mean of its divisors is an integer number (5129027497).

Almost surely, 2^20431332433 is an apocalyptic number.

It is an amenable number.

20431332433 is a deficient number, since it is larger than the sum of its proper divisors (84777555).

20431332433 is an equidigital number, since it uses as much as digits as its factorization.

20431332433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84777554.

The product of its (nonzero) digits is 15552, while the sum is 28.

Adding to 20431332433 its reverse (33423313402), we get a palindrome (53854645835).

The spelling of 20431332433 in words is "twenty billion, four hundred thirty-one million, three hundred thirty-two thousand, four hundred thirty-three".