20084749 has 4 divisors (see below), whose sum is σ = 20145760. Its totient is φ = 20023740.

The previous prime is 20084737. The next prime is 20084761. The reversal of 20084749 is 94748002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94748002 = 2 ⋅47374001.

It is an interprime number because it is at equal distance from previous prime (20084737) and next prime (20084761).

It is a cyclic number.

It is not a de Polignac number, because 20084749 - 2⁵ = 20084717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20084149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30009 + ... + 30670.

It is an arithmetic number, because the mean of its divisors is an integer number (5036440).

Almost surely, 2^20084749 is an apocalyptic number.

It is an amenable number.

20084749 is a deficient number, since it is larger than the sum of its proper divisors (61011).

20084749 is an equidigital number, since it uses as much as digits as its factorization.

20084749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61010.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20084749 is about 4481.6011647624. The cubic root of 20084749 is about 271.8246283392.

The spelling of 20084749 in words is "twenty million, eighty-four thousand, seven hundred forty-nine".