20001355541 has 4 divisors (see below), whose sum is σ = 20021179500. Its totient is φ = 19981531584.

The previous prime is 20001355513. The next prime is 20001355547. The reversal of 20001355541 is 14555310002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14995227025 + 5006128516 = 122455^2 + 70754^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001355541 - 2³⁰ = 18927613717 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20001355541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001355547) 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, 9910466 + ... + 9912483.

It is an arithmetic number, because the mean of its divisors is an integer number (5005294875).

Almost surely, 2^20001355541 is an apocalyptic number.

It is an amenable number.

20001355541 is a deficient number, since it is larger than the sum of its proper divisors (19823959).

20001355541 is a wasteful number, since it uses less digits than its factorization.

20001355541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19823958.

The product of its (nonzero) digits is 3000, while the sum is 26.

Adding to 20001355541 its reverse (14555310002), we get a palindrome (34556665543).

The spelling of 20001355541 in words is "twenty billion, one million, three hundred fifty-five thousand, five hundred forty-one".