30136820 has 48 divisors (see below), whose sum is σ = 72817920. Its totient is φ = 10262784.

The previous prime is 30136811. The next prime is 30136837. The reversal of 30136820 is 2863103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22736 + ... + 24024.

It is an arithmetic number, because the mean of its divisors is an integer number (1517040).

Almost surely, 2^30136820 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 30136820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36408960).

30136820 is an abundant number, since it is smaller than the sum of its proper divisors (42681100).

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

30136820 is a wasteful number, since it uses less digits than its factorization.

30136820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472 (or 1470 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 30136820 is about 5489.7012669179. The cubic root of 30136820 is about 311.1949026949.

Adding to 30136820 its reverse (2863103), we get a palindrome (32999923).

The spelling of 30136820 in words is "thirty million, one hundred thirty-six thousand, eight hundred twenty".