20133671 has 4 divisors (see below), whose sum is σ = 21009072. Its totient is φ = 19258272.

The previous prime is 20133649. The next prime is 20133677. The reversal of 20133671 is 17633102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20133671 - 2¹⁴ = 20117287 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 875377 = 20133671 / (2 + 0 + 1 + 3 + 3 + 6 + 7 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20133677) 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, 437666 + ... + 437711.

It is an arithmetic number, because the mean of its divisors is an integer number (5252268).

Almost surely, 2^20133671 is an apocalyptic number.

20133671 is a deficient number, since it is larger than the sum of its proper divisors (875401).

20133671 is an equidigital number, since it uses as much as digits as its factorization.

20133671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875400.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 20133671 is about 4487.0559390317. The cubic root of 20133671 is about 272.0451509173.

Adding to 20133671 its reverse (17633102), we get a palindrome (37766773).

The spelling of 20133671 in words is "twenty million, one hundred thirty-three thousand, six hundred seventy-one".