20019687618 has 32 divisors (see below), whose sum is σ = 45763485696. Its totient is φ = 5719385808.

The previous prime is 20019687617. The next prime is 20019687637. The reversal of 20019687618 is 81678691002.

It is not an unprimeable number, because it can be changed into a prime (20019687613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 851205 + ... + 874407.

It is an arithmetic number, because the mean of its divisors is an integer number (1430108928).

Almost surely, 2^20019687618 is an apocalyptic number.

20019687618 is an abundant number, since it is smaller than the sum of its proper divisors (25743798078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20019687618 is a wasteful number, since it uses less digits than its factorization.

20019687618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43758.

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 20019687618 in words is "twenty billion, nineteen million, six hundred eighty-seven thousand, six hundred eighteen".