30929920 has 88 divisors (see below), whose sum is σ = 84893184. Its totient is φ = 10592256.

The previous prime is 30929897. The next prime is 30929923. The reversal of 30929920 is 2992903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30929923) 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, 35409 + ... + 36271.

Almost surely, 2^30929920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30929920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42446592).

30929920 is an abundant number, since it is smaller than the sum of its proper divisors (53963264).

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

30929920 is an equidigital number, since it uses as much as digits as its factorization.

30929920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895 (or 877 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 30929920 is about 5561.4674322520. The cubic root of 30929920 is about 313.9011684037.

The spelling of 30929920 in words is "thirty million, nine hundred twenty-nine thousand, nine hundred twenty".