20664461200 has 30 divisors (see below), whose sum is σ = 49646368994. Its totient is φ = 8265784320.

The previous prime is 20664461141. The next prime is 20664461201. The reversal of 20664461200 is 216446602.

It can be written as a sum of positive squares in 3 ways, for example, as 254338704 + 20410122496 = 15948^2 + 142864^2 .

It is not an unprimeable number, because it can be changed into a prime (20664461201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25830177 + ... + 25830976.

Almost surely, 2^20664461200 is an apocalyptic number.

20664461200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20664461200 is an abundant number, since it is smaller than the sum of its proper divisors (28981907794).

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

20664461200 is a wasteful number, since it uses less digits than its factorization.

20664461200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51661171 (or 51661160 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The spelling of 20664461200 in words is "twenty billion, six hundred sixty-four million, four hundred sixty-one thousand, two hundred".