20668992 has 56 divisors (see below), whose sum is σ = 55388256. Its totient is φ = 6801408.

The previous prime is 20668931. The next prime is 20668997. The reversal of 20668992 is 29986602.

It is a zygodrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (20668997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15288 + ... + 16584.

It is an arithmetic number, because the mean of its divisors is an integer number (989076).

Almost surely, 2^20668992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20668992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27694128).

20668992 is an abundant number, since it is smaller than the sum of its proper divisors (34719264).

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

20668992 is a wasteful number, since it uses less digits than its factorization.

20668992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395 (or 1385 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 20668992 is about 4546.3163110369. The cubic root of 20668992 is about 274.4351690453.

The spelling of 20668992 in words is "twenty million, six hundred sixty-eight thousand, nine hundred ninety-two".