20994724 has 27 divisors (see below), whose sum is σ = 38539137. Its totient is φ = 10007088.

The previous prime is 20994713. The next prime is 20994749. The reversal of 20994724 is 42749902.

The square root of 20994724 is 4582.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 11009124 + 9985600 = 3318^2 + 3160^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 265717 + ... + 265795.

Almost surely, 2^20994724 is an apocalyptic number.

20994724 is the 4582-nd square number.

It is an amenable number.

20994724 is a deficient number, since it is larger than the sum of its proper divisors (17544413).

20994724 is an equidigital number, since it uses as much as digits as its factorization.

20994724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The cubic root of 20994724 is about 275.8693108077.

The spelling of 20994724 in words is "twenty million, nine hundred ninety-four thousand, seven hundred twenty-four".