20666466600 has 96 divisors (see below), whose sum is σ = 68994229920. Its totient is φ = 5087128320.

The previous prime is 20666466589. The next prime is 20666466607. The reversal of 20666466600 is 666466602.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20666466607) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1316974 + ... + 1332573.

It is an arithmetic number, because the mean of its divisors is an integer number (718689895).

Almost surely, 2^20666466600 is an apocalyptic number.

20666466600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20666466600 is an abundant number, since it is smaller than the sum of its proper divisors (48327763320).

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

20666466600 is a wasteful number, since it uses less digits than its factorization.

20666466600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2649579 (or 2649570 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 42.

The spelling of 20666466600 in words is "twenty billion, six hundred sixty-six million, four hundred sixty-six thousand, six hundred".