20154434045 has 4 divisors (see below), whose sum is σ = 24185320860. Its totient is φ = 16123547232.

The previous prime is 20154434039. The next prime is 20154434059. The reversal of 20154434045 is 54043445102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54043445102 = 2 ⋅27021722551.

It can be written as a sum of positive squares in 2 ways, for example, as 3026430169 + 17128003876 = 55013^2 + 130874^2 .

It is a cyclic number.

It is not a de Polignac number, because 20154434045 - 2²² = 20150239741 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2015443400 + ... + 2015443409.

It is an arithmetic number, because the mean of its divisors is an integer number (6046330215).

Almost surely, 2^20154434045 is an apocalyptic number.

It is an amenable number.

20154434045 is a deficient number, since it is larger than the sum of its proper divisors (4030886815).

20154434045 is an equidigital number, since it uses as much as digits as its factorization.

20154434045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030886814.

The product of its (nonzero) digits is 38400, while the sum is 32.

Adding to 20154434045 its reverse (54043445102), we get a palindrome (74197879147).

The spelling of 20154434045 in words is "twenty billion, one hundred fifty-four million, four hundred thirty-four thousand, forty-five".