20765237 has 2 divisors, whose sum is σ = 20765238. Its totient is φ = 20765236.

The previous prime is 20765231. The next prime is 20765287. The reversal of 20765237 is 73256702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10817521 + 9947716 = 3289^2 + 3154^2 .

It is a cyclic number.

It is not a de Polignac number, because 20765237 - 2⁸ = 20764981 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20765231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10382618 + 10382619.

It is an arithmetic number, because the mean of its divisors is an integer number (10382619).

Almost surely, 2^20765237 is an apocalyptic number.

It is an amenable number.

20765237 is a deficient number, since it is larger than the sum of its proper divisors (1).

20765237 is an equidigital number, since it uses as much as digits as its factorization.

20765237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 32.

The square root of 20765237 is about 4556.8889606836. Note that the first 3 decimals coincide. The cubic root of 20765237 is about 274.8604779854.

The spelling of 20765237 in words is "twenty million, seven hundred sixty-five thousand, two hundred thirty-seven".