20205221543 has 8 divisors (see below), whose sum is σ = 21836909136. Its totient is φ = 18584596800.

The previous prime is 20205221527. The next prime is 20205221551. The reversal of 20205221543 is 34512250202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20205221543 - 2⁴ = 20205221527 is a prime.

It is a super-2 number, since 2×20205221543² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205221513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2761913 + ... + 2769218.

It is an arithmetic number, because the mean of its divisors is an integer number (2729613642).

Almost surely, 2^20205221543 is an apocalyptic number.

20205221543 is a deficient number, since it is larger than the sum of its proper divisors (1631687593).

20205221543 is a wasteful number, since it uses less digits than its factorization.

20205221543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5531425.

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 20205221543 its reverse (34512250202), we get a palindrome (54717471745).

The spelling of 20205221543 in words is "twenty billion, two hundred five million, two hundred twenty-one thousand, five hundred forty-three".