30820956 has 12 divisors (see below), whose sum is σ = 71915592. Its totient is φ = 10273648.

The previous prime is 30820901. The next prime is 30820957. The reversal of 30820956 is 65902803.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×30820956³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30820957) 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 3 ways as a sum of consecutive naturals, for example, 1284195 + ... + 1284218.

It is an arithmetic number, because the mean of its divisors is an integer number (5992966).

Almost surely, 2^30820956 is an apocalyptic number.

It is an amenable number.

30820956 is an abundant number, since it is smaller than the sum of its proper divisors (41094636).

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

30820956 is a wasteful number, since it uses less digits than its factorization.

30820956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568420 (or 2568418 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 30820956 is about 5551.6624537160. The cubic root of 30820956 is about 313.5321172095.

The spelling of 30820956 in words is "thirty million, eight hundred twenty thousand, nine hundred fifty-six".