20647448 has 8 divisors (see below), whose sum is σ = 38713980. Its totient is φ = 10323720.

The previous prime is 20647447. The next prime is 20647453. The reversal of 20647448 is 84474602.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20647447) 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 as a sum of consecutive naturals, namely, 1290458 + ... + 1290473.

Almost surely, 2^20647448 is an apocalyptic number.

It is an amenable number.

20647448 is a deficient number, since it is larger than the sum of its proper divisors (18066532).

20647448 is a wasteful number, since it uses less digits than its factorization.

20647448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2580937 (or 2580933 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 35.

The square root of 20647448 is about 4543.9463024996. The cubic root of 20647448 is about 274.3397848305.

The spelling of 20647448 in words is "twenty million, six hundred forty-seven thousand, four hundred forty-eight".