20018894 has 48 divisors (see below), whose sum is σ = 38514528. Its totient is φ = 7617024.

The previous prime is 20018893. The next prime is 20018909. The reversal of 20018894 is 49881002.

It is a happy number.

It is a super-2 number, since 2×20018894² = 801512233966472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20018894.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20018891) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85802 + ... + 86034.

It is an arithmetic number, because the mean of its divisors is an integer number (802386).

Almost surely, 2^20018894 is an apocalyptic number.

20018894 is a deficient number, since it is larger than the sum of its proper divisors (18495634).

20018894 is a wasteful number, since it uses less digits than its factorization.

20018894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 20018894 is about 4474.2478697542. The cubic root of 20018894 is about 271.5272117676.

Adding to 20018894 its reverse (49881002), we get a palindrome (69899896).

The spelling of 20018894 in words is "twenty million, eighteen thousand, eight hundred ninety-four".