30993520 has 40 divisors (see below), whose sum is σ = 72406080. Its totient is φ = 12337920.

The previous prime is 30993511. The next prime is 30993563. The reversal of 30993520 is 2539903.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 18310 + ... + 19930.

It is an arithmetic number, because the mean of its divisors is an integer number (1810152).

Almost surely, 2^30993520 is an apocalyptic number.

It is an amenable number.

30993520 is an abundant number, since it is smaller than the sum of its proper divisors (41412560).

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

30993520 is a wasteful number, since it uses less digits than its factorization.

30993520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1873 (or 1867 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 31.

The square root of 30993520 is about 5567.1824112382. The cubic root of 30993520 is about 314.1161753841.

It can be divided in two parts, 30993 and 520, that added together give a palindrome (31513).

The spelling of 30993520 in words is "thirty million, nine hundred ninety-three thousand, five hundred twenty".