20557611315 has 24 divisors (see below), whose sum is σ = 35641711248. Its totient is φ = 10961438400.

The previous prime is 20557611313. The next prime is 20557611377. The reversal of 20557611315 is 51311675502.

It is a happy number.

20557611315 is a `hidden beast` number, since 2 + 0 + 5 + 5 + 7 + 611 + 31 + 5 = 666.

It is not a de Polignac number, because 20557611315 - 2¹ = 20557611313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20557611315.

It is not an unprimeable number, because it can be changed into a prime (20557611313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143640 + ... + 248490.

It is an arithmetic number, because the mean of its divisors is an integer number (1485071302).

Almost surely, 2^20557611315 is an apocalyptic number.

20557611315 is a deficient number, since it is larger than the sum of its proper divisors (15084099933).

20557611315 is a wasteful number, since it uses less digits than its factorization.

20557611315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109219 (or 109216 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The spelling of 20557611315 in words is "twenty billion, five hundred fifty-seven million, six hundred eleven thousand, three hundred fifteen".