20665144600 has 48 divisors (see below), whose sum is σ = 48126685320. Its totient is φ = 8252256000.

The previous prime is 20665144589. The next prime is 20665144603. The reversal of 20665144600 is 644156602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20665144603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34239 + ... + 206161.

Almost surely, 2^20665144600 is an apocalyptic number.

20665144600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20665144600 is an abundant number, since it is smaller than the sum of its proper divisors (27461540720).

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

20665144600 is a wasteful number, since it uses less digits than its factorization.

20665144600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172540 (or 172531 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 20665144600 in words is "twenty billion, six hundred sixty-five million, one hundred forty-four thousand, six hundred".