20140543765 has 4 divisors (see below), whose sum is σ = 24168652524. Its totient is φ = 16112435008.

The previous prime is 20140543763. The next prime is 20140543831. The reversal of 20140543765 is 56734504102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56734504102 = 2 ⋅28367252051.

It can be written as a sum of positive squares in 2 ways, for example, as 15817086756 + 4323457009 = 125766^2 + 65753^2 .

It is a cyclic number.

It is not a de Polignac number, because 20140543765 - 2¹ = 20140543763 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20140543763) 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, 2014054372 + ... + 2014054381.

It is an arithmetic number, because the mean of its divisors is an integer number (6042163131).

Almost surely, 2^20140543765 is an apocalyptic number.

It is an amenable number.

20140543765 is a deficient number, since it is larger than the sum of its proper divisors (4028108759).

20140543765 is an equidigital number, since it uses as much as digits as its factorization.

20140543765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028108758.

The product of its (nonzero) digits is 100800, while the sum is 37.

The spelling of 20140543765 in words is "twenty billion, one hundred forty million, five hundred forty-three thousand, seven hundred sixty-five".