20193539 has 4 divisors (see below), whose sum is σ = 20259624. Its totient is φ = 20127456.

The previous prime is 20193533. The next prime is 20193559. The reversal of 20193539 is 93539102.

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 20193539 - 2²⁰ = 19144963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20193533) 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, 32582 + ... + 33195.

It is an arithmetic number, because the mean of its divisors is an integer number (5064906).

Almost surely, 2^20193539 is an apocalyptic number.

20193539 is a deficient number, since it is larger than the sum of its proper divisors (66085).

20193539 is an equidigital number, since it uses as much as digits as its factorization.

20193539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66084.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 20193539 is about 4493.7221765481. The cubic root of 20193539 is about 272.3145285623.

The spelling of 20193539 in words is "twenty million, one hundred ninety-three thousand, five hundred thirty-nine".