65020820 has 24 divisors (see below), whose sum is σ = 138584544. Its totient is φ = 25619616.

The previous prime is 65020807. The next prime is 65020841. The reversal of 65020820 is 2802056.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 22922 + ... + 25601.

It is an arithmetic number, because the mean of its divisors is an integer number (5774356).

Almost surely, 2^65020820 is an apocalyptic number.

It is an amenable number.

65020820 is an abundant number, since it is smaller than the sum of its proper divisors (73563724).

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

65020820 is a wasteful number, since it uses less digits than its factorization.

65020820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48599 (or 48597 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 65020820 is about 8063.5488465067. The cubic root of 65020820 is about 402.1155002559.

Adding to 65020820 its reverse (2802056), we get a palindrome (67822876).

The spelling of 65020820 in words is "sixty-five million, twenty thousand, eight hundred twenty".