20618922 has 8 divisors (see below), whose sum is σ = 41237856. Its totient is φ = 6872972.

The previous prime is 20618903. The next prime is 20618929. The reversal of 20618922 is 22981602.

It is a sphenic number, since it is the product of 3 distinct primes.

20618922 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 20618922.

It is not an unprimeable number, because it can be changed into a prime (20618929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1718238 + ... + 1718249.

It is an arithmetic number, because the mean of its divisors is an integer number (5154732).

Almost surely, 2^20618922 is an apocalyptic number.

20618922 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20618922 is a wasteful number, since it uses less digits than its factorization.

20618922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3436492.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20618922 is about 4540.8063160633. The cubic root of 20618922 is about 274.2133862645.

The spelling of 20618922 in words is "twenty million, six hundred eighteen thousand, nine hundred twenty-two".