20533543541 has 24 divisors (see below), whose sum is σ = 24027640920. Its totient is φ = 17496041472.

The previous prime is 20533543529. The next prime is 20533543543. The reversal of 20533543541 is 14534533502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6667539025 + 13866004516 = 81655^2 + 117754^2 .

It is not a de Polignac number, because 20533543541 - 2⁶ = 20533543477 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 (20533543543) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 10961981 + ... + 10963853.

It is an arithmetic number, because the mean of its divisors is an integer number (1001151705).

Almost surely, 2^20533543541 is an apocalyptic number.

It is an amenable number.

20533543541 is a deficient number, since it is larger than the sum of its proper divisors (3494097379).

20533543541 is a wasteful number, since it uses less digits than its factorization.

20533543541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3093 (or 3086 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 35.

The spelling of 20533543541 in words is "twenty billion, five hundred thirty-three million, five hundred forty-three thousand, five hundred forty-one".