20489237 has 2 divisors, whose sum is σ = 20489238. Its totient is φ = 20489236.

The previous prime is 20489221. The next prime is 20489257. The reversal of 20489237 is 73298402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13734436 + 6754801 = 3706^2 + 2599^2 .

It is a cyclic number.

It is not a de Polignac number, because 20489237 - 2⁴ = 20489221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20489197 and 20489206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20489257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10244618 + 10244619.

It is an arithmetic number, because the mean of its divisors is an integer number (10244619).

Almost surely, 2^20489237 is an apocalyptic number.

It is an amenable number.

20489237 is a deficient number, since it is larger than the sum of its proper divisors (1).

20489237 is an equidigital number, since it uses as much as digits as its factorization.

20489237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 20489237 is about 4526.5038385049. The cubic root of 20489237 is about 273.6372782229.

The spelling of 20489237 in words is "twenty million, four hundred eighty-nine thousand, two hundred thirty-seven".