20830637 has 2 divisors, whose sum is σ = 20830638. Its totient is φ = 20830636.

The previous prime is 20830633. The next prime is 20830639. The reversal of 20830637 is 73603802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19945156 + 885481 = 4466^2 + 941^2 .

It is a cyclic number.

It is not a de Polignac number, because 20830637 - 2² = 20830633 is a prime.

Together with 20830639, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20830633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10415318 + 10415319.

It is an arithmetic number, because the mean of its divisors is an integer number (10415319).

Almost surely, 2^20830637 is an apocalyptic number.

It is an amenable number.

20830637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20830637 is an equidigital number, since it uses as much as digits as its factorization.

20830637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20830637 is about 4564.0592678010. The cubic root of 20830637 is about 275.1487327671.

The spelling of 20830637 in words is "twenty million, eight hundred thirty thousand, six hundred thirty-seven".