20487443 has 4 divisors (see below), whose sum is σ = 20529000. Its totient is φ = 20445888.

The previous prime is 20487433. The next prime is 20487449. The reversal of 20487443 is 34478402.

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 20487443 - 2²² = 16293139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20487449) 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, 20030 + ... + 21027.

It is an arithmetic number, because the mean of its divisors is an integer number (5132250).

Almost surely, 2^20487443 is an apocalyptic number.

20487443 is a deficient number, since it is larger than the sum of its proper divisors (41557).

20487443 is an equidigital number, since it uses as much as digits as its factorization.

20487443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41556.

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 20487443 is about 4526.3056679813. The cubic root of 20487443 is about 273.6292915971.

The spelling of 20487443 in words is "twenty million, four hundred eighty-seven thousand, four hundred forty-three".