20523543 has 4 divisors (see below), whose sum is σ = 27364728. Its totient is φ = 13682360.

The previous prime is 20523541. The next prime is 20523557. The reversal of 20523543 is 34532502.

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 20523543 - 2¹ = 20523541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523541) 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, 3420588 + ... + 3420593.

It is an arithmetic number, because the mean of its divisors is an integer number (6841182).

Almost surely, 2^20523543 is an apocalyptic number.

20523543 is a deficient number, since it is larger than the sum of its proper divisors (6841185).

20523543 is an equidigital number, since it uses as much as digits as its factorization.

20523543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6841184.

The product of its (nonzero) digits is 3600, while the sum is 24.

The square root of 20523543 is about 4530.2917124618. The cubic root of 20523543 is about 273.7899139065.

The spelling of 20523543 in words is "twenty million, five hundred twenty-three thousand, five hundred forty-three".