20551318200 has 144 divisors (see below), whose sum is σ = 78877964880. Its totient is φ = 4697441280.

The previous prime is 20551318187. The next prime is 20551318201. The reversal of 20551318200 is 281315502.

It is a happy number.

20551318200 is a `hidden beast` number, since 2 + 0 + 551 + 31 + 82 + 0 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551318201) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 802929 + ... + 828128.

It is an arithmetic number, because the mean of its divisors is an integer number (547763645).

Almost surely, 2^20551318200 is an apocalyptic number.

20551318200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20551318200 is an abundant number, since it is smaller than the sum of its proper divisors (58326646680).

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

20551318200 is a wasteful number, since it uses less digits than its factorization.

20551318200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631086 (or 1631074 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The spelling of 20551318200 in words is "twenty billion, five hundred fifty-one million, three hundred eighteen thousand, two hundred".