20447677720 has 32 divisors (see below), whose sum is σ = 46875341520. Its totient is φ = 8024748160.

The previous prime is 20447677711. The next prime is 20447677721. The reversal of 20447677720 is 2777674402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20447677721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4820446 + ... + 4824685.

Almost surely, 2^20447677720 is an apocalyptic number.

20447677720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20447677720 is an abundant number, since it is smaller than the sum of its proper divisors (26427663800).

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

20447677720 is a wasteful number, since it uses less digits than its factorization.

20447677720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9645195 (or 9645191 counting only the distinct ones).

The product of its (nonzero) digits is 921984, while the sum is 46.

The spelling of 20447677720 in words is "twenty billion, four hundred forty-seven million, six hundred seventy-seven thousand, seven hundred twenty".