20820648 has 32 divisors (see below), whose sum is σ = 55114560. Its totient is φ = 6531840.

The previous prime is 20820617. The next prime is 20820649. The reversal of 20820648 is 84602802.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20820649) 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 7 ways as a sum of consecutive naturals, for example, 25108 + ... + 25923.

It is an arithmetic number, because the mean of its divisors is an integer number (1722330).

Almost surely, 2^20820648 is an apocalyptic number.

It is an amenable number.

20820648 is an abundant number, since it is smaller than the sum of its proper divisors (34293912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20820648 is a wasteful number, since it uses less digits than its factorization.

20820648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51057 (or 51053 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 20820648 is about 4562.9648256369. The cubic root of 20820648 is about 275.1047446718.

The spelling of 20820648 in words is "twenty million, eight hundred twenty thousand, six hundred forty-eight".