20716018 has 4 divisors (see below), whose sum is σ = 31074030. Its totient is φ = 10358008.

The previous prime is 20716001. The next prime is 20716037. The reversal of 20716018 is 81061702.

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., 17698849 + 3017169 = 4207^2 + 1737^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20715983 and 20716001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5179003 + ... + 5179006.

Almost surely, 2^20716018 is an apocalyptic number.

20716018 is a deficient number, since it is larger than the sum of its proper divisors (10358012).

20716018 is a wasteful number, since it uses less digits than its factorization.

20716018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10358011.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 20716018 is about 4551.4852520908. The cubic root of 20716018 is about 274.6431426293.

The spelling of 20716018 in words is "twenty million, seven hundred sixteen thousand, eighteen".