20615413231513 has 4 divisors (see below), whose sum is σ = 21700434980560. Its totient is φ = 19530391482468.

The previous prime is 20615413231481. The next prime is 20615413231577. The reversal of 20615413231513 is 31513231451602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20615413231513 - 2⁵ = 20615413231481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20615413231013) 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, 542510874495 + ... + 542510874532.

It is an arithmetic number, because the mean of its divisors is an integer number (5425108745140).

Almost surely, 2^{20615413231513} is an apocalyptic number.

It is an amenable number.

20615413231513 is a deficient number, since it is larger than the sum of its proper divisors (1085021749047).

20615413231513 is a wasteful number, since it uses less digits than its factorization.

20615413231513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085021749046.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 20615413231513 in words is "twenty trillion, six hundred fifteen billion, four hundred thirteen million, two hundred thirty-one thousand, five hundred thirteen".