20602543 has 4 divisors (see below), whose sum is σ = 22187368. Its totient is φ = 19017720.

The previous prime is 20602523. The next prime is 20602577. The reversal of 20602543 is 34520602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20602543 - 2⁵ = 20602511 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 (20602513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792393 + ... + 792418.

It is an arithmetic number, because the mean of its divisors is an integer number (5546842).

Almost surely, 2^20602543 is an apocalyptic number.

20602543 is a deficient number, since it is larger than the sum of its proper divisors (1584825).

20602543 is a wasteful number, since it uses less digits than its factorization.

20602543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584824.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 20602543 is about 4539.0024234406. The cubic root of 20602543 is about 274.1407583027.

Subtracting from 20602543 its sum of digits (22), we obtain a square (20602521 = 4539²).

The spelling of 20602543 in words is "twenty million, six hundred two thousand, five hundred forty-three".