20411143 has 4 divisors (see below), whose sum is σ = 21298608. Its totient is φ = 19523680.

The previous prime is 20411141. The next prime is 20411147. The reversal of 20411143 is 34111402.

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 20411143 - 2¹ = 20411141 is a prime.

It is a super-2 number, since 2×20411143² = 833229517132898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20411141) 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, 443698 + ... + 443743.

It is an arithmetic number, because the mean of its divisors is an integer number (5324652).

Almost surely, 2^20411143 is an apocalyptic number.

20411143 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20411143 is a deficient number, since it is larger than the sum of its proper divisors (887465).

20411143 is an equidigital number, since it uses as much as digits as its factorization.

20411143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887464.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 20411143 is about 4517.8692986849. The cubic root of 20411143 is about 273.2891826699.

Adding to 20411143 its reverse (34111402), we get a palindrome (54522545).

The spelling of 20411143 in words is "twenty million, four hundred eleven thousand, one hundred forty-three".