20535214015 has 4 divisors (see below), whose sum is σ = 24642256824. Its totient is φ = 16428171208.

The previous prime is 20535214013. The next prime is 20535214027. The reversal of 20535214015 is 51041253502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20535214015 - 2¹ = 20535214013 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 (20535214013) 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, 2053521397 + ... + 2053521406.

It is an arithmetic number, because the mean of its divisors is an integer number (6160564206).

Almost surely, 2^20535214015 is an apocalyptic number.

20535214015 is a deficient number, since it is larger than the sum of its proper divisors (4107042809).

20535214015 is an equidigital number, since it uses as much as digits as its factorization.

20535214015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4107042808.

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 20535214015 its reverse (51041253502), we get a palindrome (71576467517).

The spelling of 20535214015 in words is "twenty billion, five hundred thirty-five million, two hundred fourteen thousand, fifteen".