20847043 has 8 divisors (see below), whose sum is σ = 23853312. Its totient is φ = 17847816.

The previous prime is 20847017. The next prime is 20847053. The reversal of 20847043 is 34074802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20847043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20847053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8946 + ... + 11032.

It is an arithmetic number, because the mean of its divisors is an integer number (2981664).

Almost surely, 2^20847043 is an apocalyptic number.

20847043 is a deficient number, since it is larger than the sum of its proper divisors (3006269).

20847043 is a wasteful number, since it uses less digits than its factorization.

20847043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3521.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 20847043 is about 4565.8562176223. The cubic root of 20847043 is about 275.2209486022.

The spelling of 20847043 in words is "twenty million, eight hundred forty-seven thousand, forty-three".