20428042 has 16 divisors (see below), whose sum is σ = 31337280. Its totient is φ = 9984352.

The previous prime is 20428019. The next prime is 20428061. The reversal of 20428042 is 24082402.

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, 27123 + ... + 27865.

It is an arithmetic number, because the mean of its divisors is an integer number (1958580).

Almost surely, 2^20428042 is an apocalyptic number.

20428042 is a deficient number, since it is larger than the sum of its proper divisors (10909238).

20428042 is a wasteful number, since it uses less digits than its factorization.

20428042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 20428042 is about 4519.7391517653. The cubic root of 20428042 is about 273.3645833132.

The spelling of 20428042 in words is "twenty million, four hundred twenty-eight thousand, forty-two".