20768543 has 8 divisors (see below), whose sum is σ = 22700160. Its totient is φ = 18915840.

The previous prime is 20768497. The next prime is 20768549. The reversal of 20768543 is 34586702.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20768543 - 2⁶ = 20768479 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 (20768549) 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, 19178 + ... + 20231.

It is an arithmetic number, because the mean of its divisors is an integer number (2837520).

Almost surely, 2^20768543 is an apocalyptic number.

20768543 is a deficient number, since it is larger than the sum of its proper divisors (1931617).

20768543 is a wasteful number, since it uses less digits than its factorization.

20768543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39457.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 20768543 is about 4557.2516937295. The cubic root of 20768543 is about 274.8750639097.

The spelling of 20768543 in words is "twenty million, seven hundred sixty-eight thousand, five hundred forty-three".