20354543 has 4 divisors (see below), whose sum is σ = 22204968. Its totient is φ = 18504120.

The previous prime is 20354527. The next prime is 20354561. The reversal of 20354543 is 34545302.

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 20354543 - 2⁴ = 20354527 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 (20354513) 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, 925196 + ... + 925217.

It is an arithmetic number, because the mean of its divisors is an integer number (5551242).

Almost surely, 2^20354543 is an apocalyptic number.

20354543 is a deficient number, since it is larger than the sum of its proper divisors (1850425).

20354543 is a wasteful number, since it uses less digits than its factorization.

20354543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850424.

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 20354543 is about 4511.6009353665. The cubic root of 20354543 is about 273.0363389573.

Adding to 20354543 its reverse (34545302), we get a palindrome (54899845).

The spelling of 20354543 in words is "twenty million, three hundred fifty-four thousand, five hundred forty-three".