20400023143 has 8 divisors (see below), whose sum is σ = 20594196000. Its totient is φ = 20206614048.

The previous prime is 20400023129. The next prime is 20400023207. The reversal of 20400023143 is 34132000402.

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 20400023143 - 2²⁵ = 20366468711 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20400023143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400020143) 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, 137196 + ... + 244177.

It is an arithmetic number, because the mean of its divisors is an integer number (2574274500).

Almost surely, 2^20400023143 is an apocalyptic number.

20400023143 is a deficient number, since it is larger than the sum of its proper divisors (194172857).

20400023143 is a wasteful number, since it uses less digits than its factorization.

20400023143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381881.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 20400023143 its reverse (34132000402), we get a palindrome (54532023545).

The spelling of 20400023143 in words is "twenty billion, four hundred million, twenty-three thousand, one hundred forty-three".