20724842 has 16 divisors (see below), whose sum is σ = 31744032. Its totient is φ = 10145520.

The previous prime is 20724841. The next prime is 20724889. The reversal of 20724842 is 24842702.

It is not an unprimeable number, because it can be changed into a prime (20724841) by changing a digit.

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, 27908 + ... + 28640.

It is an arithmetic number, because the mean of its divisors is an integer number (1984002).

Almost surely, 2^20724842 is an apocalyptic number.

20724842 is a deficient number, since it is larger than the sum of its proper divisors (11019190).

20724842 is a wasteful number, since it uses less digits than its factorization.

20724842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013.

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 20724842 is about 4552.4545027930. The cubic root of 20724842 is about 274.6821318965.

The spelling of 20724842 in words is "twenty million, seven hundred twenty-four thousand, eight hundred forty-two".