20055651660 has 72 divisors (see below), whose sum is σ = 66365981136. Its totient is φ = 4861975680.

The previous prime is 20055651653. The next prime is 20055651673. The reversal of 20055651660 is 6615655002.

It is a happy number.

20055651660 is a `hidden beast` number, since 20 + 0 + 5 + 565 + 16 + 60 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5062579 + ... + 5066538.

It is an arithmetic number, because the mean of its divisors is an integer number (921749738).

Almost surely, 2^20055651660 is an apocalyptic number.

20055651660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20055651660 is an abundant number, since it is smaller than the sum of its proper divisors (46310329476).

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

20055651660 is a wasteful number, since it uses less digits than its factorization.

20055651660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10129143 (or 10129138 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 20055651660 in words is "twenty billion, fifty-five million, six hundred fifty-one thousand, six hundred sixty".