20447133 has 16 divisors (see below), whose sum is σ = 31535616. Its totient is φ = 11542320.

The previous prime is 20447131. The next prime is 20447159. The reversal of 20447133 is 33174402.

It is not a de Polignac number, because 20447133 - 2¹ = 20447131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20447131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4123 + ... + 7608.

It is an arithmetic number, because the mean of its divisors is an integer number (1970976).

Almost surely, 2^20447133 is an apocalyptic number.

It is an amenable number.

20447133 is a deficient number, since it is larger than the sum of its proper divisors (11088483).

20447133 is a wasteful number, since it uses less digits than its factorization.

20447133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11824.

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 20447133 is about 4521.8506167276. The cubic root of 20447133 is about 273.4497143039.

The spelling of 20447133 in words is "twenty million, four hundred forty-seven thousand, one hundred thirty-three".