20018017836 has 48 divisors (see below), whose sum is σ = 51909698400. Its totient is φ = 6671241216.

The previous prime is 20018017829. The next prime is 20018017867. The reversal of 20018017836 is 63871081002.

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 20018017836.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 565260 + ... + 599628.

It is an arithmetic number, because the mean of its divisors is an integer number (1081452050).

Almost surely, 2^20018017836 is an apocalyptic number.

It is an amenable number.

20018017836 is an abundant number, since it is smaller than the sum of its proper divisors (31891680564).

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

20018017836 is a wasteful number, since it uses less digits than its factorization.

20018017836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39775 (or 39767 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

Adding to 20018017836 its reverse (63871081002), we get a palindrome (83889098838).

The spelling of 20018017836 in words is "twenty billion, eighteen million, seventeen thousand, eight hundred thirty-six".