20450918 has 4 divisors (see below), whose sum is σ = 30676380. Its totient is φ = 10225458.

The previous prime is 20450893. The next prime is 20450939. The reversal of 20450918 is 81905402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81905402 = 2 ⋅40952701.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5112728 + ... + 5112731.

It is an arithmetic number, because the mean of its divisors is an integer number (7669095).

Almost surely, 2^20450918 is an apocalyptic number.

20450918 is a deficient number, since it is larger than the sum of its proper divisors (10225462).

20450918 is a wasteful number, since it uses less digits than its factorization.

20450918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10225461.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 20450918 is about 4522.2691206959. The cubic root of 20450918 is about 273.4665861609.

The spelling of 20450918 in words is "twenty million, four hundred fifty thousand, nine hundred eighteen".