20557617315 has 8 divisors (see below), whose sum is σ = 32892187728. Its totient is φ = 10964062560.

The previous prime is 20557617299. The next prime is 20557617317. The reversal of 20557617315 is 51371675502.

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

It is not a de Polignac number, because 20557617315 - 2⁴ = 20557617299 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20557617317) 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, 685253896 + ... + 685253925.

It is an arithmetic number, because the mean of its divisors is an integer number (4111523466).

Almost surely, 2^20557617315 is an apocalyptic number.

20557617315 is a deficient number, since it is larger than the sum of its proper divisors (12334570413).

20557617315 is a wasteful number, since it uses less digits than its factorization.

20557617315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1370507829.

The product of its (nonzero) digits is 220500, while the sum is 42.

The spelling of 20557617315 in words is "twenty billion, five hundred fifty-seven million, six hundred seventeen thousand, three hundred fifteen".