20319631 has 2 divisors, whose sum is σ = 20319632. Its totient is φ = 20319630.

The previous prime is 20319613. The next prime is 20319667. The reversal of 20319631 is 13691302.

Together with previous prime (20319613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20319631 - 2⁵ = 20319599 is a prime.

It is a super-2 number, since 2×20319631² = 825774807952322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20319596 and 20319605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20319931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10159815 + 10159816.

It is an arithmetic number, because the mean of its divisors is an integer number (10159816).

Almost surely, 2^20319631 is an apocalyptic number.

20319631 is a deficient number, since it is larger than the sum of its proper divisors (1).

20319631 is an equidigital number, since it uses as much as digits as its factorization.

20319631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 20319631 is about 4507.7301383290. The cubic root of 20319631 is about 272.8801461482.

The spelling of 20319631 in words is "twenty million, three hundred nineteen thousand, six hundred thirty-one".