20739284 has 12 divisors (see below), whose sum is σ = 37871904. Its totient is φ = 9918744.

The previous prime is 20739283. The next prime is 20739343. The reversal of 20739284 is 48293702.

20739284 = 240² + 241² + ... + 423².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20739283) 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, 112622 + ... + 112805.

It is an arithmetic number, because the mean of its divisors is an integer number (3155992).

Almost surely, 2^20739284 is an apocalyptic number.

It is an amenable number.

20739284 is a deficient number, since it is larger than the sum of its proper divisors (17132620).

20739284 is a wasteful number, since it uses less digits than its factorization.

20739284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225454 (or 225452 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 20739284 is about 4554.0404038612. The cubic root of 20739284 is about 274.7459206940.

The spelling of 20739284 in words is "twenty million, seven hundred thirty-nine thousand, two hundred eighty-four".