20530121543 has 8 divisors (see below), whose sum is σ = 20590564560. Its totient is φ = 20469758400.

The previous prime is 20530121537. The next prime is 20530121567. The reversal of 20530121543 is 34512103502.

It is a happy number.

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 20530121543 - 2²² = 20525927239 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 (20530124543) 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, 515771 + ... + 554147.

It is an arithmetic number, because the mean of its divisors is an integer number (2573820570).

Almost surely, 2^20530121543 is an apocalyptic number.

20530121543 is a deficient number, since it is larger than the sum of its proper divisors (60443017).

20530121543 is a wasteful number, since it uses less digits than its factorization.

20530121543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39937.

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 20530121543 in words is "twenty billion, five hundred thirty million, one hundred twenty-one thousand, five hundred forty-three".