20155000542 has 32 divisors (see below), whose sum is σ = 40660849152. Its totient is φ = 6660076704.

The previous prime is 20155000511. The next prime is 20155000543. The reversal of 20155000542 is 24500055102.

It is a happy number.

20155000542 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155000543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346783 + ... + 400709.

It is an arithmetic number, because the mean of its divisors is an integer number (1270651536).

Almost surely, 2^20155000542 is an apocalyptic number.

20155000542 is an abundant number, since it is smaller than the sum of its proper divisors (20505848610).

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

20155000542 is a wasteful number, since it uses less digits than its factorization.

20155000542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54472.

The product of its (nonzero) digits is 2000, while the sum is 24.

Adding to 20155000542 its reverse (24500055102), we get a palindrome (44655055644).

The spelling of 20155000542 in words is "twenty billion, one hundred fifty-five million, five hundred forty-two", and thus it is an aban number.