20018974 has 4 divisors (see below), whose sum is σ = 30028464. Its totient is φ = 10009486.

The previous prime is 20018969. The next prime is 20018981. The reversal of 20018974 is 47981002.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5004742 + ... + 5004745.

It is an arithmetic number, because the mean of its divisors is an integer number (7507116).

Almost surely, 2^20018974 is an apocalyptic number.

20018974 is a deficient number, since it is larger than the sum of its proper divisors (10009490).

20018974 is a wasteful number, since it uses less digits than its factorization.

20018974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10009489.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20018974 is about 4474.2568097953. The cubic root of 20018974 is about 271.5275734618.

Adding to 20018974 its reverse (47981002), we get a palindrome (67999976).

The spelling of 20018974 in words is "twenty million, eighteen thousand, nine hundred seventy-four".