30197920 has 48 divisors (see below), whose sum is σ = 73285128. Its totient is φ = 11750400.

The previous prime is 30197917. The next prime is 30197929. The reversal of 30197920 is 2979103.

It can be written as a sum of positive squares in 4 ways, for example, as 20034576 + 10163344 = 4476^2 + 3188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30197929) 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, 3370 + ... + 8470.

Almost surely, 2^30197920 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 30197920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36642564).

30197920 is an abundant number, since it is smaller than the sum of its proper divisors (43087208).

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

30197920 is a wasteful number, since it uses less digits than its factorization.

30197920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5153 (or 5145 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 30197920 is about 5495.2634149784. The cubic root of 30197920 is about 311.4050683463.

The spelling of 30197920 in words is "thirty million, one hundred ninety-seven thousand, nine hundred twenty".