20415506044513 has 8 divisors (see below), whose sum is σ = 20621234154600. Its totient is φ = 20209848412800.

The previous prime is 20415506044429. The next prime is 20415506044517. The reversal of 20415506044513 is 31544060551402.

It can be written as a sum of positive squares in 4 ways, for example, as 4616017874064 + 15799488170449 = 2148492^2 + 3974857^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20415506044513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20415506044517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17037238 + ... + 18196111.

It is an arithmetic number, because the mean of its divisors is an integer number (2577654269325).

Almost surely, 2^{20415506044513} is an apocalyptic number.

It is an amenable number.

20415506044513 is a deficient number, since it is larger than the sum of its proper divisors (205728110087).

20415506044513 is a wasteful number, since it uses less digits than its factorization.

20415506044513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35239187.

The product of its (nonzero) digits is 288000, while the sum is 40.

Adding to 20415506044513 its reverse (31544060551402), we get a palindrome (51959566595915).

The spelling of 20415506044513 in words is "twenty trillion, four hundred fifteen billion, five hundred six million, forty-four thousand, five hundred thirteen".