20400505039 has 16 divisors (see below), whose sum is σ = 21429302400. Its totient is φ = 19394758656.

The previous prime is 20400505033. The next prime is 20400505091. The reversal of 20400505039 is 93050500402.

It is not a de Polignac number, because 20400505039 - 2²⁹ = 19863634127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20400504998 and 20400505016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400505033) 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, 842607 + ... + 866479.

It is an arithmetic number, because the mean of its divisors is an integer number (1339331400).

Almost surely, 2^20400505039 is an apocalyptic number.

20400505039 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20400505039 is a deficient number, since it is larger than the sum of its proper divisors (1028797361).

20400505039 is a wasteful number, since it uses less digits than its factorization.

20400505039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24354.

The product of its (nonzero) digits is 5400, while the sum is 28.

The spelling of 20400505039 in words is "twenty billion, four hundred million, five hundred five thousand, thirty-nine".