20004428 has 12 divisors (see below), whose sum is σ = 35051352. Its totient is φ = 9989760.

The previous prime is 20004419. The next prime is 20004431. The reversal of 20004428 is 82440002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1148 + ... + 6428.

It is an arithmetic number, because the mean of its divisors is an integer number (2920946).

Almost surely, 2^20004428 is an apocalyptic number.

It is an amenable number.

20004428 is a deficient number, since it is larger than the sum of its proper divisors (15046924).

20004428 is a wasteful number, since it uses less digits than its factorization.

20004428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6232 (or 6230 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 20004428 is about 4472.6309930510. The cubic root of 20004428 is about 271.4617925833.

The spelling of 20004428 in words is "twenty million, four thousand, four hundred twenty-eight".