20472133 has 4 divisors (see below), whose sum is σ = 22333248. Its totient is φ = 18611020.

The previous prime is 20472113. The next prime is 20472143. The reversal of 20472133 is 33127402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20472133 - 2²¹ = 18374981 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20472103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 930541 + ... + 930562.

It is an arithmetic number, because the mean of its divisors is an integer number (5583312).

Almost surely, 2^20472133 is an apocalyptic number.

It is an amenable number.

20472133 is a deficient number, since it is larger than the sum of its proper divisors (1861115).

20472133 is a wasteful number, since it uses less digits than its factorization.

20472133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861114.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 20472133 is about 4524.6141271936. The cubic root of 20472133 is about 273.5611147401.

Adding to 20472133 its reverse (33127402), we get a palindrome (53599535).

The spelling of 20472133 in words is "twenty million, four hundred seventy-two thousand, one hundred thirty-three".