20471428 has 12 divisors (see below), whose sum is σ = 36279040. Its totient is φ = 10105992.

The previous prime is 20471413. The next prime is 20471441. The reversal of 20471428 is 82417402.

It is a junction number, because it is equal to n+sod(n) for n = 20471396 and 20471405.

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 3 ways as a sum of consecutive naturals, for example, 32076 + ... + 32707.

Almost surely, 2^20471428 is an apocalyptic number.

It is an amenable number.

20471428 is a deficient number, since it is larger than the sum of its proper divisors (15807612).

20471428 is a wasteful number, since it uses less digits than its factorization.

20471428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64866 (or 64864 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 20471428 is about 4524.5362193268. The cubic root of 20471428 is about 273.5579744908.

The spelling of 20471428 in words is "twenty million, four hundred seventy-one thousand, four hundred twenty-eight".