Search a number
-
+
20744 = 232593

20744 has 8 divisors (see below), whose sum is σ = 38910. Its totient is φ = 10368.

The previous prime is 20743. The next prime is 20747. The reversal of 20744 is 44702.

20744 = T29 + T30 + ... + T52.

It can be written as a sum of positive squares in only one way, i.e., 16900 + 3844 = 130^2 + 62^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1289 + ... + 1304.

220744 is an apocalyptic number.

It is an amenable number.

20744 is a deficient number, since it is larger than the sum of its proper divisors (18166).

20744 is a wasteful number, since it uses less digits than its factorization.

20744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2599 (or 2595 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 20744 is about 144.0277750991. The cubic root of 20744 is about 27.4766744357.

The spelling of 20744 in words is "twenty thousand, seven hundred forty-four", and thus it is an iban number.

Divisors: 1 2 4 8 2593 5186 10372 20744