20400340013 has 8 divisors (see below), whose sum is σ = 20428262400. Its totient is φ = 20372437008.

The previous prime is 20400339991. The next prime is 20400340019. The reversal of 20400340013 is 31004300402.

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 20400340013 - 2¹⁰ = 20400338989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20400339973 and 20400340000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400340019) 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, 4610120 + ... + 4614542.

It is an arithmetic number, because the mean of its divisors is an integer number (2553532800).

Almost surely, 2^20400340013 is an apocalyptic number.

It is an amenable number.

20400340013 is a deficient number, since it is larger than the sum of its proper divisors (27922387).

20400340013 is a wasteful number, since it uses less digits than its factorization.

20400340013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9691.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 20400340013 its reverse (31004300402), we get a palindrome (51404640415).

The spelling of 20400340013 in words is "twenty billion, four hundred million, three hundred forty thousand, thirteen".