20018672018 has 4 divisors (see below), whose sum is σ = 30028008030. Its totient is φ = 10009336008.

The previous prime is 20018671927. The next prime is 20018672027. The reversal of 20018672018 is 81027681002.

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

It can be written as a sum of positive squares in only one way, i.e., 10315042969 + 9703629049 = 101563^2 + 98507^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5004668003 + ... + 5004668006.

Almost surely, 2^20018672018 is an apocalyptic number.

20018672018 is a deficient number, since it is larger than the sum of its proper divisors (10009336012).

20018672018 is a wasteful number, since it uses less digits than its factorization.

20018672018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10009336011.

The product of its (nonzero) digits is 10752, while the sum is 35.

The spelling of 20018672018 in words is "twenty billion, eighteen million, six hundred seventy-two thousand, eighteen".