20743345 has 16 divisors (see below), whose sum is σ = 29946240. Its totient is φ = 13474944.

The previous prime is 20743337. The next prime is 20743357. The reversal of 20743345 is 54334702.

It is not a de Polignac number, because 20743345 - 2³ = 20743337 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 14932 + ... + 16261.

It is an arithmetic number, because the mean of its divisors is an integer number (1871640).

Almost surely, 2^20743345 is an apocalyptic number.

It is an amenable number.

20743345 is a deficient number, since it is larger than the sum of its proper divisors (9202895).

20743345 is a wasteful number, since it uses less digits than its factorization.

20743345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31224.

The product of its (nonzero) digits is 10080, while the sum is 28.

The square root of 20743345 is about 4554.4862498420. The cubic root of 20743345 is about 274.7638523701.

The spelling of 20743345 in words is "twenty million, seven hundred forty-three thousand, three hundred forty-five".