20352749 has 4 divisors (see below), whose sum is σ = 20399136. Its totient is φ = 20306364.

The previous prime is 20352737. The next prime is 20352763. The reversal of 20352749 is 94725302.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20352749 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 (20352049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22529 + ... + 23414.

It is an arithmetic number, because the mean of its divisors is an integer number (5099784).

Almost surely, 2^20352749 is an apocalyptic number.

It is an amenable number.

20352749 is a deficient number, since it is larger than the sum of its proper divisors (46387).

20352749 is an equidigital number, since it uses as much as digits as its factorization.

20352749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46386.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20352749 is about 4511.4021102092. The cubic root of 20352749 is about 273.0283171350.

The spelling of 20352749 in words is "twenty million, three hundred fifty-two thousand, seven hundred forty-nine".