820590663 has 16 divisors (see below), whose sum is σ = 1161427680. Its totient is φ = 513570816.

The previous prime is 820590643. The next prime is 820590691. The reversal of 820590663 is 366095028.

It is not a de Polignac number, because 820590663 - 2⁶ = 820590599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820590623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18 + ... + 40511.

It is an arithmetic number, because the mean of its divisors is an integer number (72589230).

Almost surely, 2^820590663 is an apocalyptic number.

820590663 is a deficient number, since it is larger than the sum of its proper divisors (340837017).

820590663 is a wasteful number, since it uses less digits than its factorization.

820590663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40946.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 820590663 is about 28645.9536933229. The cubic root of 820590663 is about 936.2148460808.

The spelling of 820590663 in words is "eight hundred twenty million, five hundred ninety thousand, six hundred sixty-three".