65605020 has 96 divisors (see below), whose sum is σ = 199214400. Its totient is φ = 16035840.

The previous prime is 65605019. The next prime is 65605037. The reversal of 65605020 is 2050656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187806 + ... + 188154.

It is an arithmetic number, because the mean of its divisors is an integer number (2075150).

Almost surely, 2^65605020 is an apocalyptic number.

65605020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65605020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99607200).

65605020 is an abundant number, since it is smaller than the sum of its proper divisors (133609380).

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

65605020 is a wasteful number, since it uses less digits than its factorization.

65605020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615 (or 613 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 65605020 is about 8099.6925867591. The cubic root of 65605020 is about 403.3162223615.

Adding to 65605020 its reverse (2050656), we get a palindrome (67655676).

The spelling of 65605020 in words is "sixty-five million, six hundred five thousand, twenty".