20400023310043 has 16 divisors (see below), whose sum is σ = 23269110925536. Its totient is φ = 17717347929600.

The previous prime is 20400023309947. The next prime is 20400023310089. The reversal of 20400023310043 is 34001332000402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20400023310043 - 2¹³ = 20400023301851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20400023309996 and 20400023310023.

It is not an unprimeable number, because it can be changed into a prime (20400023310643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14289108 + ... + 15651793.

It is an arithmetic number, because the mean of its divisors is an integer number (1454319432846).

Almost surely, 2^{20400023310043} is an apocalyptic number.

20400023310043 is a deficient number, since it is larger than the sum of its proper divisors (2869087615493).

20400023310043 is a wasteful number, since it uses less digits than its factorization.

20400023310043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29944014.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 20400023310043 its reverse (34001332000402), we get a palindrome (54401355310445).

The spelling of 20400023310043 in words is "twenty trillion, four hundred billion, twenty-three million, three hundred ten thousand, forty-three".