20186728494 has 32 divisors (see below), whose sum is σ = 41814576000. Its totient is φ = 6489266784.

The previous prime is 20186728493. The next prime is 20186728501. The reversal of 20186728494 is 49482768102.

It is a super-3 number, since 3×20186728494³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20186728493) 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, 81937 + ... + 216995.

It is an arithmetic number, because the mean of its divisors is an integer number (1306705500).

Almost surely, 2^20186728494 is an apocalyptic number.

20186728494 is an abundant number, since it is smaller than the sum of its proper divisors (21627847506).

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

20186728494 is a wasteful number, since it uses less digits than its factorization.

20186728494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135952.

The product of its (nonzero) digits is 1548288, while the sum is 51.

The spelling of 20186728494 in words is "twenty billion, one hundred eighty-six million, seven hundred twenty-eight thousand, four hundred ninety-four".