20018549 has 8 divisors (see below), whose sum is σ = 20246688. Its totient is φ = 19792080.

The previous prime is 20018543. The next prime is 20018567. The reversal of 20018549 is 94581002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20018549 - 2⁸ = 20018293 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 (20018543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60314 + ... + 60644.

It is an arithmetic number, because the mean of its divisors is an integer number (2530836).

Almost surely, 2^20018549 is an apocalyptic number.

It is an amenable number.

20018549 is a deficient number, since it is larger than the sum of its proper divisors (228139).

20018549 is a wasteful number, since it uses less digits than its factorization.

20018549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 20018549 is about 4474.2093156221. The cubic root of 20018549 is about 271.5256519508.

The spelling of 20018549 in words is "twenty million, eighteen thousand, five hundred forty-nine".