20007861660 has 36 divisors (see below), whose sum is σ = 60690514248. Its totient is φ = 5335429728.

The previous prime is 20007861637. The next prime is 20007861691. The reversal of 20007861660 is 6616870002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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 (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55577214 + ... + 55577573.

It is an arithmetic number, because the mean of its divisors is an integer number (1685847618).

Almost surely, 2^20007861660 is an apocalyptic number.

20007861660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20007861660 is an abundant number, since it is smaller than the sum of its proper divisors (40682652588).

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

20007861660 is a wasteful number, since it uses less digits than its factorization.

20007861660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111154802 (or 111154797 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 20007861660 in words is "twenty billion, seven million, eight hundred sixty-one thousand, six hundred sixty".