20180505492 has 108 divisors (see below), whose sum is σ = 61397525280. Its totient is φ = 5459731776.

The previous prime is 20180505487. The next prime is 20180505497. The reversal of 20180505492 is 29450508102.

It is an interprime number because it is at equal distance from previous prime (20180505487) and next prime (20180505497).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20180505497) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9828738 + ... + 9830790.

Almost surely, 2^20180505492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20180505492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30698762640).

20180505492 is an abundant number, since it is smaller than the sum of its proper divisors (41217019788).

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

20180505492 is a wasteful number, since it uses less digits than its factorization.

20180505492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4142 (or 2084 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The spelling of 20180505492 in words is "twenty billion, one hundred eighty million, five hundred five thousand, four hundred ninety-two".