20180394036 has 54 divisors (see below), whose sum is σ = 56070560546. Its totient is φ = 6115269600.

The previous prime is 20180394029. The next prime is 20180394071. The reversal of 20180394036 is 63049308102.

It can be written as a sum of positive squares in only one way, i.e., 19374969636 + 805424400 = 139194^2 + 28380^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2312035 + ... + 2320746.

Almost surely, 2^20180394036 is an apocalyptic number.

It is an amenable number.

20180394036 is an abundant number, since it is smaller than the sum of its proper divisors (35890166510).

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

20180394036 is a wasteful number, since it uses less digits than its factorization.

20180394036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4632813 (or 4632797 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 20180394036 in words is "twenty billion, one hundred eighty million, three hundred ninety-four thousand, thirty-six".