20628428 has 12 divisors (see below), whose sum is σ = 36450960. Its totient is φ = 10213872.

The previous prime is 20628409. The next prime is 20628437. The reversal of 20628428 is 82482602.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20628394 and 20628403.

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 3 ways as a sum of consecutive naturals, for example, 24623 + ... + 25446.

It is an arithmetic number, because the mean of its divisors is an integer number (3037580).

Almost surely, 2^20628428 is an apocalyptic number.

It is an amenable number.

20628428 is a deficient number, since it is larger than the sum of its proper divisors (15822532).

20628428 is a wasteful number, since it uses less digits than its factorization.

20628428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50176 (or 50174 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 20628428 is about 4541.8529258443. The cubic root of 20628428 is about 274.2555202481.

The spelling of 20628428 in words is "twenty million, six hundred twenty-eight thousand, four hundred twenty-eight".