20451628 has 12 divisors (see below), whose sum is σ = 35971600. Its totient is φ = 10174032.

The previous prime is 20451601. The next prime is 20451637. The reversal of 20451628 is 82615402.

It is a junction number, because it is equal to n+sod(n) for n = 20451596 and 20451605.

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, 12051 + ... + 13642.

Almost surely, 2^20451628 is an apocalyptic number.

It is an amenable number.

20451628 is a deficient number, since it is larger than the sum of its proper divisors (15519972).

20451628 is a wasteful number, since it uses less digits than its factorization.

20451628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25896 (or 25894 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 20451628 is about 4522.3476204290. The cubic root of 20451628 is about 273.4697507952.

The spelling of 20451628 in words is "twenty million, four hundred fifty-one thousand, six hundred twenty-eight".