20668930 has 8 divisors (see below), whose sum is σ = 37204092. Its totient is φ = 8267568.

The previous prime is 20668919. The next prime is 20668931. The reversal of 20668930 is 3986602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20169081 + 499849 = 4491^2 + 707^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20668931) 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, 1033437 + ... + 1033456.

Almost surely, 2^20668930 is an apocalyptic number.

20668930 is a deficient number, since it is larger than the sum of its proper divisors (16535162).

20668930 is a wasteful number, since it uses less digits than its factorization.

20668930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066900.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 20668930 is about 4546.3094923245. The cubic root of 20668930 is about 274.4348946407.

The spelling of 20668930 in words is "twenty million, six hundred sixty-eight thousand, nine hundred thirty".