20743644 has 48 divisors (see below), whose sum is σ = 49787136. Its totient is φ = 6720000.

The previous prime is 20743637. The next prime is 20743651. The reversal of 20743644 is 44634702.

It is an interprime number because it is at equal distance from previous prime (20743637) and next prime (20743651).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 82519 + ... + 82769.

It is an arithmetic number, because the mean of its divisors is an integer number (1037232).

Almost surely, 2^20743644 is an apocalyptic number.

It is an amenable number.

20743644 is an abundant number, since it is smaller than the sum of its proper divisors (29043492).

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

20743644 is a wasteful number, since it uses less digits than its factorization.

20743644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426 (or 424 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 30.

The square root of 20743644 is about 4554.5190745017. The cubic root of 20743644 is about 274.7651725364.

The spelling of 20743644 in words is "twenty million, seven hundred forty-three thousand, six hundred forty-four".