820909420 has 24 divisors (see below), whose sum is σ = 1730013264. Its totient is φ = 327201216.

The previous prime is 820909403. The next prime is 820909429. The reversal of 820909420 is 24909028.

820909420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (820909429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66859 + ... + 78178.

It is an arithmetic number, because the mean of its divisors is an integer number (72083886).

Almost surely, 2^820909420 is an apocalyptic number.

It is an amenable number.

820909420 is an abundant number, since it is smaller than the sum of its proper divisors (909103844).

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

820909420 is a wasteful number, since it uses less digits than its factorization.

820909420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145329 (or 145327 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 820909420 is about 28651.5168882906. The cubic root of 820909420 is about 936.3360540580.

The spelling of 820909420 in words is "eight hundred twenty million, nine hundred nine thousand, four hundred twenty".