20735543 has 4 divisors (see below), whose sum is σ = 20747328. Its totient is φ = 20723760.

The previous prime is 20735537. The next prime is 20735557. The reversal of 20735543 is 34553702.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20735543 - 2¹⁶ = 20670007 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 (20795543) 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, 2663 + ... + 6968.

It is an arithmetic number, because the mean of its divisors is an integer number (5186832).

Almost surely, 2^20735543 is an apocalyptic number.

20735543 is a deficient number, since it is larger than the sum of its proper divisors (11785).

20735543 is an equidigital number, since it uses as much as digits as its factorization.

20735543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11784.

The product of its (nonzero) digits is 12600, while the sum is 29.

The square root of 20735543 is about 4553.6296511684. The cubic root of 20735543 is about 274.7293999325.

The spelling of 20735543 in words is "twenty million, seven hundred thirty-five thousand, five hundred forty-three".