20745349 has 4 divisors (see below), whose sum is σ = 20755564. Its totient is φ = 20735136.

The previous prime is 20745343. The next prime is 20745421. The reversal of 20745349 is 94354702.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 16144324 + 4601025 = 4018^2 + 2145^2 .

It is a cyclic number.

It is not a de Polignac number, because 20745349 - 2³ = 20745341 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 (20745341) 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, 912 + ... + 6505.

It is an arithmetic number, because the mean of its divisors is an integer number (5188891).

Almost surely, 2^20745349 is an apocalyptic number.

It is an amenable number.

20745349 is a deficient number, since it is larger than the sum of its proper divisors (10215).

20745349 is an equidigital number, since it uses as much as digits as its factorization.

20745349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10214.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 20745349 is about 4554.7062473885. The cubic root of 20745349 is about 274.7727003328.

The spelling of 20745349 in words is "twenty million, seven hundred forty-five thousand, three hundred forty-nine".