20431703687 has 2 divisors, whose sum is σ = 20431703688. Its totient is φ = 20431703686.

The previous prime is 20431703683. The next prime is 20431703693. The reversal of 20431703687 is 78630713402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20431703687 - 2² = 20431703683 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20431703683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215851843 + 10215851844.

It is an arithmetic number, because the mean of its divisors is an integer number (10215851844).

Almost surely, 2^20431703687 is an apocalyptic number.

20431703687 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431703687 is an equidigital number, since it uses as much as digits as its factorization.

20431703687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 41.

The spelling of 20431703687 in words is "twenty billion, four hundred thirty-one million, seven hundred three thousand, six hundred eighty-seven".