20725648 has 20 divisors (see below), whose sum is σ = 40302108. Its totient is φ = 10325120.

The previous prime is 20725631. The next prime is 20725667. The reversal of 20725648 is 84652702.

It can be written as a sum of positive squares in 2 ways, for example, as 18558864 + 2166784 = 4308^2 + 1472^2 .

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 3 ways as a sum of consecutive naturals, for example, 2478 + ... + 6898.

Almost surely, 2^20725648 is an apocalyptic number.

It is an amenable number.

20725648 is a deficient number, since it is larger than the sum of its proper divisors (19576460).

20725648 is a wasteful number, since it uses less digits than its factorization.

20725648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4722 (or 4716 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 20725648 is about 4552.5430256067. The cubic root of 20725648 is about 274.6856926945.

The spelling of 20725648 in words is "twenty million, seven hundred twenty-five thousand, six hundred forty-eight".