20431444651 has 2 divisors, whose sum is σ = 20431444652. Its totient is φ = 20431444650.

The previous prime is 20431444639. The next prime is 20431444669. The reversal of 20431444651 is 15644413402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20431444651 - 2²⁷ = 20297226923 is a prime.

It is not a weakly prime, because it can be changed into another prime (20431444681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215722325 + 10215722326.

It is an arithmetic number, because the mean of its divisors is an integer number (10215722326).

Almost surely, 2^20431444651 is an apocalyptic number.

20431444651 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431444651 is an equidigital number, since it uses as much as digits as its factorization.

20431444651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 34.

The spelling of 20431444651 in words is "twenty billion, four hundred thirty-one million, four hundred forty-four thousand, six hundred fifty-one".