30913020 has 72 divisors (see below), whose sum is σ = 94270176. Its totient is φ = 8199552.

The previous prime is 30913009. The next prime is 30913033. The reversal of 30913020 is 2031903.

It is a super-2 number, since 2×30913020² = 1911229611040800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 30912984 and 30913002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47014 + ... + 47666.

It is an arithmetic number, because the mean of its divisors is an integer number (1309308).

Almost surely, 2^30913020 is an apocalyptic number.

30913020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30913020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47135088).

30913020 is an abundant number, since it is smaller than the sum of its proper divisors (63357156).

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

30913020 is a wasteful number, since it uses less digits than its factorization.

30913020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931 (or 926 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 30913020 is about 5559.9478414820. The cubic root of 30913020 is about 313.8439864880.

Adding to 30913020 its reverse (2031903), we get a palindrome (32944923).

The spelling of 30913020 in words is "thirty million, nine hundred thirteen thousand, twenty".