20145540239 has 16 divisors (see below), whose sum is σ = 22246358400. Its totient is φ = 18090612960.

The previous prime is 20145540223. The next prime is 20145540253. The reversal of 20145540239 is 93204554102.

It is a cyclic number.

It is not a de Polignac number, because 20145540239 - 2⁴ = 20145540223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20145540199 and 20145540208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145540539) 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, 386252 + ... + 435294.

It is an arithmetic number, because the mean of its divisors is an integer number (1390397400).

Almost surely, 2^20145540239 is an apocalyptic number.

20145540239 is a deficient number, since it is larger than the sum of its proper divisors (2100818161).

20145540239 is a wasteful number, since it uses less digits than its factorization.

20145540239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49510.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 20145540239 in words is "twenty billion, one hundred forty-five million, five hundred forty thousand, two hundred thirty-nine".