20803643 has 8 divisors (see below), whose sum is σ = 24595680. Its totient is φ = 17216640.

The previous prime is 20803637. The next prime is 20803667. The reversal of 20803643 is 34630802.

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

It is not a de Polignac number, because 20803643 - 2¹⁴ = 20787259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20803603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51038 + ... + 51443.

It is an arithmetic number, because the mean of its divisors is an integer number (3074460).

Almost surely, 2^20803643 is an apocalyptic number.

20803643 is a deficient number, since it is larger than the sum of its proper divisors (3792037).

20803643 is a wasteful number, since it uses less digits than its factorization.

20803643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102517.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20803643 is about 4561.1010732059. The cubic root of 20803643 is about 275.0298281695.

The spelling of 20803643 in words is "twenty million, eight hundred three thousand, six hundred forty-three".