20018884 has 6 divisors (see below), whose sum is σ = 35033054. Its totient is φ = 10009440.

The previous prime is 20018881. The next prime is 20018891. The reversal of 20018884 is 48881002.

It can be written as a sum of positive squares in only one way, i.e., 18249984 + 1768900 = 4272^2 + 1330^2 .

It is not an unprimeable number, because it can be changed into a prime (20018881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2502357 + ... + 2502364.

Almost surely, 2^20018884 is an apocalyptic number.

It is an amenable number.

20018884 is a deficient number, since it is larger than the sum of its proper divisors (15014170).

20018884 is a wasteful number, since it uses less digits than its factorization.

20018884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5004725 (or 5004723 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 20018884 is about 4474.2467522478. The cubic root of 20018884 is about 271.5271665558.

Adding to 20018884 its reverse (48881002), we get a palindrome (68899886).

It can be divided in two parts, 20018 and 884, that added together give a palindrome (20902).

The spelling of 20018884 in words is "twenty million, eighteen thousand, eight hundred eighty-four".