18820541 has 4 divisors (see below), whose sum is σ = 19258272. Its totient is φ = 18382812.

The previous prime is 18820519. The next prime is 18820553. The reversal of 18820541 is 14502881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18820541 - 2¹⁰ = 18819517 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 (18820591) 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, 218801 + ... + 218886.

It is an arithmetic number, because the mean of its divisors is an integer number (4814568).

Almost surely, 2^18820541 is an apocalyptic number.

It is an amenable number.

18820541 is a deficient number, since it is larger than the sum of its proper divisors (437731).

18820541 is an equidigital number, since it uses as much as digits as its factorization.

18820541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437730.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 18820541 is about 4338.2647452639. The cubic root of 18820541 is about 265.9973853550.

The spelling of 18820541 in words is "eighteen million, eight hundred twenty thousand, five hundred forty-one".