20995237 has 2 divisors, whose sum is σ = 20995238. Its totient is φ = 20995236.

The previous prime is 20995231. The next prime is 20995267. The reversal of 20995237 is 73259902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18438436 + 2556801 = 4294^2 + 1599^2 .

It is a cyclic number.

It is not a de Polignac number, because 20995237 - 2⁷ = 20995109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20995196 and 20995205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20995231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10497618 + 10497619.

It is an arithmetic number, because the mean of its divisors is an integer number (10497619).

Almost surely, 2^20995237 is an apocalyptic number.

It is an amenable number.

20995237 is a deficient number, since it is larger than the sum of its proper divisors (1).

20995237 is an equidigital number, since it uses as much as digits as its factorization.

20995237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 20995237 is about 4582.0559795795. The cubic root of 20995237 is about 275.8715577183.

The spelling of 20995237 in words is "twenty million, nine hundred ninety-five thousand, two hundred thirty-seven".