20218585500 has 96 divisors (see below), whose sum is σ = 65418400320. Its totient is φ = 5391619200.

The previous prime is 20218585493. The next prime is 20218585529. The reversal of 20218585500 is 558581202.

20218585500 is a `hidden beast` number, since 2 + 0 + 21 + 8 + 585 + 50 + 0 = 666.

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

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 735337 + ... + 762336.

It is an arithmetic number, because the mean of its divisors is an integer number (681441670).

Almost surely, 2^20218585500 is an apocalyptic number.

20218585500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20218585500 is an abundant number, since it is smaller than the sum of its proper divisors (45199814820).

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

20218585500 is a wasteful number, since it uses less digits than its factorization.

20218585500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1497701 (or 1497683 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

The spelling of 20218585500 in words is "twenty billion, two hundred eighteen million, five hundred eighty-five thousand, five hundred".