20664743 has 12 divisors (see below), whose sum is σ = 23062200. Its totient is φ = 18498480.

The previous prime is 20664737. The next prime is 20664781. The reversal of 20664743 is 34746602.

It is not a de Polignac number, because 20664743 - 2⁴ = 20664727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664793) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6833 + ... + 9381.

It is an arithmetic number, because the mean of its divisors is an integer number (1921850).

Almost surely, 2^20664743 is an apocalyptic number.

20664743 is a deficient number, since it is larger than the sum of its proper divisors (2397457).

20664743 is a wasteful number, since it uses less digits than its factorization.

20664743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638 (or 2627 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 20664743 is about 4545.8489856131. The cubic root of 20664743 is about 274.4163622106.

The spelling of 20664743 in words is "twenty million, six hundred sixty-four thousand, seven hundred forty-three".