20628433 has 16 divisors (see below), whose sum is σ = 25400320. Its totient is φ = 16356816.

The previous prime is 20628409. The next prime is 20628437. The reversal of 20628433 is 33482602.

It is not a de Polignac number, because 20628433 - 2⁹ = 20627921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20628437) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3916 + ... + 7522.

It is an arithmetic number, because the mean of its divisors is an integer number (1587520).

Almost surely, 2^20628433 is an apocalyptic number.

It is an amenable number.

20628433 is a deficient number, since it is larger than the sum of its proper divisors (4771887).

20628433 is a wasteful number, since it uses less digits than its factorization.

20628433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3676.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 20628433 is about 4541.8534762804. The cubic root of 20628433 is about 274.2555424065.

The spelling of 20628433 in words is "twenty million, six hundred twenty-eight thousand, four hundred thirty-three".