20400014552123 has 4 divisors (see below), whose sum is σ = 20411494584600. Its totient is φ = 20388534519648.

The previous prime is 20400014552069. The next prime is 20400014552171. The reversal of 20400014552123 is 32125541000402.

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 20400014552123 - 2¹⁶ = 20400014486587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20400014552623) 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, 5740013573 + ... + 5740017126.

It is an arithmetic number, because the mean of its divisors is an integer number (5102873646150).

Almost surely, 2^{20400014552123} is an apocalyptic number.

20400014552123 is a deficient number, since it is larger than the sum of its proper divisors (11480032477).

20400014552123 is a wasteful number, since it uses less digits than its factorization.

20400014552123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11480032476.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 20400014552123 its reverse (32125541000402), we get a palindrome (52525555552525).

The spelling of 20400014552123 in words is "twenty trillion, four hundred billion, fourteen million, five hundred fifty-two thousand, one hundred twenty-three".