20750644 has 12 divisors (see below), whose sum is σ = 36346464. Its totient is φ = 10365944.

The previous prime is 20750627. The next prime is 20750647. The reversal of 20750644 is 44605702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20750647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5697 + ... + 8599.

It is an arithmetic number, because the mean of its divisors is an integer number (3028872).

Almost surely, 2^20750644 is an apocalyptic number.

It is an amenable number.

20750644 is a deficient number, since it is larger than the sum of its proper divisors (15595820).

20750644 is a wasteful number, since it uses less digits than its factorization.

20750644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4694 (or 4692 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 20750644 is about 4555.2874772071. The cubic root of 20750644 is about 274.7960758162.

The spelling of 20750644 in words is "twenty million, seven hundred fifty thousand, six hundred forty-four".