20724330 has 32 divisors (see below), whose sum is σ = 54260928. Its totient is φ = 5024000.

The previous prime is 20724287. The next prime is 20724349. The reversal of 20724330 is 3342702.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20724297 and 20724306.

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 15 ways as a sum of consecutive naturals, for example, 31071 + ... + 31730.

It is an arithmetic number, because the mean of its divisors is an integer number (1695654).

Almost surely, 2^20724330 is an apocalyptic number.

20724330 is an abundant number, since it is smaller than the sum of its proper divisors (33536598).

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

20724330 is a wasteful number, since it uses less digits than its factorization.

20724330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62822.

The product of its (nonzero) digits is 1008, while the sum is 21.

The square root of 20724330 is about 4552.3982690446. The cubic root of 20724330 is about 274.6798699024.

The spelling of 20724330 in words is "twenty million, seven hundred twenty-four thousand, three hundred thirty".