820580920 has 16 divisors (see below), whose sum is σ = 1846307160. Its totient is φ = 328232352.

The previous prime is 820580833. The next prime is 820580921. The reversal of 820580920 is 29085028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820580921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10257222 + ... + 10257301.

Almost surely, 2^820580920 is an apocalyptic number.

It is an amenable number.

820580920 is an abundant number, since it is smaller than the sum of its proper divisors (1025726240).

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

820580920 is a wasteful number, since it uses less digits than its factorization.

820580920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20514534 (or 20514530 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 820580920 is about 28645.7836338963. The cubic root of 820580920 is about 936.2111407915.

The spelling of 820580920 in words is "eight hundred twenty million, five hundred eighty thousand, nine hundred twenty".