20415215513 has 16 divisors (see below), whose sum is σ = 26792355840. Its totient is φ = 15070698000.

The previous prime is 20415215507. The next prime is 20415215519. The reversal of 20415215513 is 31551251402.

It is an interprime number because it is at equal distance from previous prime (20415215507) and next prime (20415215519).

It is a cyclic number.

It is not a de Polignac number, because 20415215513 - 2⁸ = 20415215257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20415215519) 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, 6975713 + ... + 6978638.

It is an arithmetic number, because the mean of its divisors is an integer number (1674522240).

Almost surely, 2^20415215513 is an apocalyptic number.

It is an amenable number.

20415215513 is a deficient number, since it is larger than the sum of its proper divisors (6377140327).

20415215513 is a wasteful number, since it uses less digits than its factorization.

20415215513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13954388.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 20415215513 its reverse (31551251402), we get a palindrome (51966466915).

The spelling of 20415215513 in words is "twenty billion, four hundred fifteen million, two hundred fifteen thousand, five hundred thirteen".