20443871 has 8 divisors (see below), whose sum is σ = 23934624. Its totient is φ = 17095680.

The previous prime is 20443861. The next prime is 20443879. The reversal of 20443871 is 17834402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20443871 - 2⁶ = 20443807 is a prime.

It is a super-2 number, since 2×20443871² = 835903722929282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20443879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35330 + ... + 35903.

It is an arithmetic number, because the mean of its divisors is an integer number (2991828).

Almost surely, 2^20443871 is an apocalyptic number.

20443871 is a deficient number, since it is larger than the sum of its proper divisors (3490753).

20443871 is an equidigital number, since it uses as much as digits as its factorization.

20443871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71281.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 20443871 is about 4521.4899093109. The cubic root of 20443871 is about 273.4351720792.

The spelling of 20443871 in words is "twenty million, four hundred forty-three thousand, eight hundred seventy-one".