20668732 has 24 divisors (see below), whose sum is σ = 43514240. Its totient is φ = 8391600.

The previous prime is 20668727. The next prime is 20668733. The reversal of 20668732 is 23786602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20668733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18894 + ... + 19957.

Almost surely, 2^20668732 is an apocalyptic number.

It is an amenable number.

20668732 is an abundant number, since it is smaller than the sum of its proper divisors (22845508).

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

20668732 is a wasteful number, since it uses less digits than its factorization.

20668732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38881 (or 38879 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 20668732 is about 4546.2877163682. The cubic root of 20668732 is about 274.4340183128.

The spelling of 20668732 in words is "twenty million, six hundred sixty-eight thousand, seven hundred thirty-two".