20015431632618 has 32 divisors (see below), whose sum is σ = 40323642194880. Its totient is φ = 6623015464320.

The previous prime is 20015431632611. The next prime is 20015431632629. The reversal of 20015431632618 is 81623613451002.

It is a self number, because there is not a number n which added to its sum of digits gives 20015431632618.

It is not an unprimeable number, because it can be changed into a prime (20015431632611) 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, 77649793 + ... + 77907131.

It is an arithmetic number, because the mean of its divisors is an integer number (1260113818590).

Almost surely, 2^{20015431632618} is an apocalyptic number.

20015431632618 is an abundant number, since it is smaller than the sum of its proper divisors (20308210562262).

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

20015431632618 is a wasteful number, since it uses less digits than its factorization.

20015431632618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352102.

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 20015431632618 in words is "twenty trillion, fifteen billion, four hundred thirty-one million, six hundred thirty-two thousand, six hundred eighteen".