30920838 has 32 divisors (see below), whose sum is σ = 67737600. Its totient is φ = 9351456.

The previous prime is 30920831. The next prime is 30920843. The reversal of 30920838 is 83802903.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30920799 and 30920808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30920831) 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 15 ways as a sum of consecutive naturals, for example, 1243 + ... + 7961.

It is an arithmetic number, because the mean of its divisors is an integer number (2116800).

Almost surely, 2^30920838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30920838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33868800).

30920838 is an abundant number, since it is smaller than the sum of its proper divisors (36816762).

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

30920838 is a wasteful number, since it uses less digits than its factorization.

30920838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6796.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 30920838 is about 5560.6508611852. The cubic root of 30920838 is about 313.8704416351.

The spelling of 30920838 in words is "thirty million, nine hundred twenty thousand, eight hundred thirty-eight".