20951648 has 12 divisors (see below), whose sum is σ = 41248620. Its totient is φ = 10475808.

The previous prime is 20951647. The next prime is 20951683. The reversal of 20951648 is 84615902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20951647) 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 as a sum of consecutive naturals, namely, 327338 + ... + 327401.

It is an arithmetic number, because the mean of its divisors is an integer number (3437385).

Almost surely, 2^20951648 is an apocalyptic number.

It is an amenable number.

20951648 is a deficient number, since it is larger than the sum of its proper divisors (20296972).

20951648 is an equidigital number, since it uses as much as digits as its factorization.

20951648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654749 (or 654741 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 20951648 is about 4577.2970189840. The cubic root of 20951648 is about 275.6805096762.

The spelling of 20951648 in words is "twenty million, nine hundred fifty-one thousand, six hundred forty-eight".