20204530021 has 16 divisors (see below), whose sum is σ = 22743633024. Its totient is φ = 17808905664.

The previous prime is 20204530019. The next prime is 20204530051. The reversal of 20204530021 is 12003540202.

It is a cyclic number.

It is not a de Polignac number, because 20204530021 - 2¹ = 20204530019 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 (20204530001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117955 + ... + 233071.

It is an arithmetic number, because the mean of its divisors is an integer number (1421477064).

Almost surely, 2^20204530021 is an apocalyptic number.

It is an amenable number.

20204530021 is a deficient number, since it is larger than the sum of its proper divisors (2539103003).

20204530021 is a wasteful number, since it uses less digits than its factorization.

20204530021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115740.

The product of its (nonzero) digits is 480, while the sum is 19.

The spelling of 20204530021 in words is "twenty billion, two hundred four million, five hundred thirty thousand, twenty-one".