20753849 has 4 divisors (see below), whose sum is σ = 21423360. Its totient is φ = 20084340.

The previous prime is 20753839. The next prime is 20753851. The reversal of 20753849 is 94835702.

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 not a de Polignac number, because 20753849 - 2¹² = 20749753 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20753839) 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, 334709 + ... + 334770.

It is an arithmetic number, because the mean of its divisors is an integer number (5355840).

Almost surely, 2^20753849 is an apocalyptic number.

It is an amenable number.

20753849 is a deficient number, since it is larger than the sum of its proper divisors (669511).

20753849 is an equidigital number, since it uses as much as digits as its factorization.

20753849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669510.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 20753849 is about 4555.6392526187. The cubic root of 20753849 is about 274.8102227841.

The spelling of 20753849 in words is "twenty million, seven hundred fifty-three thousand, eight hundred forty-nine".