20431174987 has 2 divisors, whose sum is σ = 20431174988. Its totient is φ = 20431174986.

The previous prime is 20431174931. The next prime is 20431175021. The reversal of 20431174987 is 78947113402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20431174987 - 2²⁷ = 20296957259 is a prime.

It is a super-2 number, since 2×20431174987² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20431174927) 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 as a sum of consecutive naturals, namely, 10215587493 + 10215587494.

It is an arithmetic number, because the mean of its divisors is an integer number (10215587494).

Almost surely, 2^20431174987 is an apocalyptic number.

20431174987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431174987 is an equidigital number, since it uses as much as digits as its factorization.

20431174987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 20431174987 in words is "twenty billion, four hundred thirty-one million, one hundred seventy-four thousand, nine hundred eighty-seven".