20478028 has 6 divisors (see below), whose sum is σ = 35836556. Its totient is φ = 10239012.

The previous prime is 20478023. The next prime is 20478037. The reversal of 20478028 is 82087402.

It is not an unprimeable number, because it can be changed into a prime (20478023) by changing a digit.

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 as a sum of consecutive naturals, namely, 2559750 + ... + 2559757.

Almost surely, 2^20478028 is an apocalyptic number.

It is an amenable number.

20478028 is a deficient number, since it is larger than the sum of its proper divisors (15358528).

20478028 is a wasteful number, since it uses less digits than its factorization.

20478028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5119511 (or 5119509 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 20478028 is about 4525.2655170719. The cubic root of 20478028 is about 273.5873697474.

The spelling of 20478028 in words is "twenty million, four hundred seventy-eight thousand, twenty-eight".