20515340442 has 8 divisors (see below), whose sum is σ = 41030680896. Its totient is φ = 6838446812.

The previous prime is 20515340441. The next prime is 20515340473. The reversal of 20515340442 is 24404351502.

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

20515340442 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20515340441) 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, 1709611698 + ... + 1709611709.

It is an arithmetic number, because the mean of its divisors is an integer number (5128835112).

Almost surely, 2^20515340442 is an apocalyptic number.

20515340442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20515340442 is a wasteful number, since it uses less digits than its factorization.

20515340442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3419223412.

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 20515340442 its reverse (24404351502), we get a palindrome (44919691944).

The spelling of 20515340442 in words is "twenty billion, five hundred fifteen million, three hundred forty thousand, four hundred forty-two".