20205442215 has 48 divisors (see below), whose sum is σ = 40956883968. Its totient is φ = 9021958848.

The previous prime is 20205442211. The next prime is 20205442217. The reversal of 20205442215 is 51224450202.

20205442215 is a `hidden beast` number, since 2 + 0 + 2 + 0 + 5 + 442 + 215 = 666.

It is not a de Polignac number, because 20205442215 - 2² = 20205442211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205442211) 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 47 ways as a sum of consecutive naturals, for example, 732319 + ... + 759408.

It is an arithmetic number, because the mean of its divisors is an integer number (853268416).

Almost surely, 2^20205442215 is an apocalyptic number.

20205442215 is an abundant number, since it is smaller than the sum of its proper divisors (20751441753).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20205442215 is a wasteful number, since it uses less digits than its factorization.

20205442215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491788 (or 1491785 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

Adding to 20205442215 its reverse (51224450202), we get a palindrome (71429892417).

The spelling of 20205442215 in words is "twenty billion, two hundred five million, four hundred forty-two thousand, two hundred fifteen".