20724746 has 16 divisors (see below), whose sum is σ = 36254400. Its totient is φ = 8881740.

The previous prime is 20724731. The next prime is 20724793. The reversal of 20724746 is 64742702.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14420 + ... + 15791.

It is an arithmetic number, because the mean of its divisors is an integer number (2265900).

Almost surely, 2^20724746 is an apocalyptic number.

20724746 is a deficient number, since it is larger than the sum of its proper divisors (15529654).

20724746 is an equidigital number, since it uses as much as digits as its factorization.

20724746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30234 (or 30220 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 32.

The square root of 20724746 is about 4552.4439590181. The cubic root of 20724746 is about 274.6817077754.

The spelling of 20724746 in words is "twenty million, seven hundred twenty-four thousand, seven hundred forty-six".