20801143 has 8 divisors (see below), whose sum is σ = 23886720. Its totient is φ = 17914680.

The previous prime is 20801117. The next prime is 20801167. The reversal of 20801143 is 34110802.

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

It is a cyclic number.

It is not a de Polignac number, because 20801143 - 2⁹ = 20800631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 20801143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20801243) 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, 49555 + ... + 49972.

It is an arithmetic number, because the mean of its divisors is an integer number (2985840).

Almost surely, 2^20801143 is an apocalyptic number.

20801143 is a deficient number, since it is larger than the sum of its proper divisors (3085577).

20801143 is a wasteful number, since it uses less digits than its factorization.

20801143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99557.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 20801143 is about 4560.8270083396. The cubic root of 20801143 is about 275.0188108345.

Adding to 20801143 its reverse (34110802), we get a palindrome (54911945).

It can be divided in two parts, 2080 and 1143, that added together give a palindrome (3223).

The spelling of 20801143 in words is "twenty million, eight hundred one thousand, one hundred forty-three".