20020918 has 4 divisors (see below), whose sum is σ = 30031380. Its totient is φ = 10010458.

The previous prime is 20020901. The next prime is 20020937. The reversal of 20020918 is 81902002.

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

It is a Smith number, since the sum of its digits (22) 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, 5005228 + ... + 5005231.

It is an arithmetic number, because the mean of its divisors is an integer number (7507845).

Almost surely, 2^20020918 is an apocalyptic number.

20020918 is a deficient number, since it is larger than the sum of its proper divisors (10010462).

20020918 is a wasteful number, since it uses less digits than its factorization.

20020918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10010461.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 20020918 is about 4474.4740473043. The cubic root of 20020918 is about 271.5363623324.

The spelling of 20020918 in words is "twenty million, twenty thousand, nine hundred eighteen".