20662644 has 12 divisors (see below), whose sum is σ = 48212864. Its totient is φ = 6887544.

The previous prime is 20662643. The next prime is 20662693. The reversal of 20662644 is 44626602.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20662643) 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 3 ways as a sum of consecutive naturals, for example, 860932 + ... + 860955.

Almost surely, 2^20662644 is an apocalyptic number.

It is an amenable number.

20662644 is an abundant number, since it is smaller than the sum of its proper divisors (27550220).

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

20662644 is a wasteful number, since it uses less digits than its factorization.

20662644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721894 (or 1721892 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 20662644 is about 4545.6181097844. The cubic root of 20662644 is about 274.4070707095.

The spelling of 20662644 in words is "twenty million, six hundred sixty-two thousand, six hundred forty-four".