20613606518 has 4 divisors (see below), whose sum is σ = 30920409780. Its totient is φ = 10306803258.

The previous prime is 20613606511. The next prime is 20613606529. The reversal of 20613606518 is 81560631602.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20613606511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5153401628 + ... + 5153401631.

It is an arithmetic number, because the mean of its divisors is an integer number (7730102445).

Almost surely, 2^20613606518 is an apocalyptic number.

20613606518 is a deficient number, since it is larger than the sum of its proper divisors (10306803262).

20613606518 is a wasteful number, since it uses less digits than its factorization.

20613606518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10306803261.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 20613606518 in words is "twenty billion, six hundred thirteen million, six hundred six thousand, five hundred eighteen".