20087213 has 2 divisors, whose sum is σ = 20087214. Its totient is φ = 20087212.

The previous prime is 20087143. The next prime is 20087231. The reversal of 20087213 is 31278002.

Together with next prime (20087231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12264004 + 7823209 = 3502^2 + 2797^2 .

It is a cyclic number.

It is not a de Polignac number, because 20087213 - 2²⁴ = 3309997 is a prime.

It is a super-2 number, since 2×20087213² = 806992252214738, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20087413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10043606 + 10043607.

It is an arithmetic number, because the mean of its divisors is an integer number (10043607).

Almost surely, 2^20087213 is an apocalyptic number.

It is an amenable number.

20087213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20087213 is an equidigital number, since it uses as much as digits as its factorization.

20087213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20087213 is about 4481.8760580810. The cubic root of 20087213 is about 271.8357437133.

The spelling of 20087213 in words is "twenty million, eighty-seven thousand, two hundred thirteen".