20454243541 has 16 divisors (see below), whose sum is σ = 21329278704. Its totient is φ = 19597054464.

The previous prime is 20454243533. The next prime is 20454243553. The reversal of 20454243541 is 14534245402.

It can be written as a sum of positive squares in 8 ways, for example, as 2221142641 + 18233100900 = 47129^2 + 135030^2 .

It is a cyclic number.

It is not a de Polignac number, because 20454243541 - 2³ = 20454243533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20454243497 and 20454243506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20454241541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1757955 + ... + 1769551.

It is an arithmetic number, because the mean of its divisors is an integer number (1333079919).

Almost surely, 2^20454243541 is an apocalyptic number.

It is an amenable number.

20454243541 is a deficient number, since it is larger than the sum of its proper divisors (875035163).

20454243541 is a wasteful number, since it uses less digits than its factorization.

20454243541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12360.

The product of its (nonzero) digits is 76800, while the sum is 34.

Adding to 20454243541 its reverse (14534245402), we get a palindrome (34988488943).

The spelling of 20454243541 in words is "twenty billion, four hundred fifty-four million, two hundred forty-three thousand, five hundred forty-one".