20085749 has 2 divisors, whose sum is σ = 20085750. Its totient is φ = 20085748.

The previous prime is 20085743. The next prime is 20085761. The reversal of 20085749 is 94758002.

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., 19864849 + 220900 = 4457^2 + 470^2 .

It is a cyclic number.

It is not a de Polignac number, because 20085749 - 2⁴ = 20085733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20085743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10042874 + 10042875.

It is an arithmetic number, because the mean of its divisors is an integer number (10042875).

Almost surely, 2^20085749 is an apocalyptic number.

It is an amenable number.

20085749 is a deficient number, since it is larger than the sum of its proper divisors (1).

20085749 is an equidigital number, since it uses as much as digits as its factorization.

20085749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 20085749 is about 4481.7127306422. The cubic root of 20085749 is about 271.8291395584.

The spelling of 20085749 in words is "twenty million, eighty-five thousand, seven hundred forty-nine".