20188541 has 4 divisors (see below), whose sum is σ = 20342784. Its totient is φ = 20034300.

The previous prime is 20188501. The next prime is 20188547. The reversal of 20188541 is 14588102.

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 20188541 - 2⁶ = 20188477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20188547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76925 + ... + 77186.

It is an arithmetic number, because the mean of its divisors is an integer number (5085696).

Almost surely, 2^20188541 is an apocalyptic number.

It is an amenable number.

20188541 is a deficient number, since it is larger than the sum of its proper divisors (154243).

20188541 is a wasteful number, since it uses less digits than its factorization.

20188541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154242.

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

The square root of 20188541 is about 4493.1660329883. The cubic root of 20188541 is about 272.2920603145.

The spelling of 20188541 in words is "twenty million, one hundred eighty-eight thousand, five hundred forty-one".