20765330 has 16 divisors (see below), whose sum is σ = 39576600. Its totient is φ = 7817472.

The previous prime is 20765321. The next prime is 20765333. The reversal of 20765330 is 3356702.

It can be written as a sum of positive squares in 4 ways, for example, as 18309841 + 2455489 = 4279^2 + 1567^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20765330.

It is not an unprimeable number, because it can be changed into a prime (20765333) 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, 60905 + ... + 61244.

Almost surely, 2^20765330 is an apocalyptic number.

20765330 is a deficient number, since it is larger than the sum of its proper divisors (18811270).

20765330 is a wasteful number, since it uses less digits than its factorization.

20765330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122173.

The product of its (nonzero) digits is 3780, while the sum is 26.

The square root of 20765330 is about 4556.8991650024. The cubic root of 20765330 is about 274.8608883184.

The spelling of 20765330 in words is "twenty million, seven hundred sixty-five thousand, three hundred thirty".