20497237 has 2 divisors, whose sum is σ = 20497238. Its totient is φ = 20497236.

The previous prime is 20497201. The next prime is 20497247. The reversal of 20497237 is 73279402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15792676 + 4704561 = 3974^2 + 2169^2 .

It is a cyclic number.

It is not a de Polignac number, because 20497237 - 2¹⁹ = 19972949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20497247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10248618 + 10248619.

It is an arithmetic number, because the mean of its divisors is an integer number (10248619).

Almost surely, 2^20497237 is an apocalyptic number.

It is an amenable number.

20497237 is a deficient number, since it is larger than the sum of its proper divisors (1).

20497237 is an equidigital number, since it uses as much as digits as its factorization.

20497237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 20497237 is about 4527.3874364803. The cubic root of 20497237 is about 273.6728873799.

The spelling of 20497237 in words is "twenty million, four hundred ninety-seven thousand, two hundred thirty-seven".