20215181736 has 48 divisors (see below), whose sum is σ = 54757903200. Its totient is φ = 6737353632.

The previous prime is 20215181717. The next prime is 20215181737. The reversal of 20215181736 is 63718151202.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20215181736.

It is not an unprimeable number, because it can be changed into a prime (20215181737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 553035 + ... + 588453.

It is an arithmetic number, because the mean of its divisors is an integer number (1140789650).

Almost surely, 2^20215181736 is an apocalyptic number.

It is an amenable number.

20215181736 is an abundant number, since it is smaller than the sum of its proper divisors (34542721464).

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

20215181736 is a wasteful number, since it uses less digits than its factorization.

20215181736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43358 (or 43351 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 20215181736 in words is "twenty billion, two hundred fifteen million, one hundred eighty-one thousand, seven hundred thirty-six".