20720847948 has 24 divisors (see below), whose sum is σ = 48354711552. Its totient is φ = 6906082704.

The previous prime is 20720847937. The next prime is 20720847949. The reversal of 20720847948 is 84974802702.

It is a self number, because there is not a number n which added to its sum of digits gives 20720847948.

It is not an unprimeable number, because it can be changed into a prime (20720847949) 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, 4740 + ... + 203627.

It is an arithmetic number, because the mean of its divisors is an integer number (2014779648).

Almost surely, 2^20720847948 is an apocalyptic number.

It is an amenable number.

20720847948 is an abundant number, since it is smaller than the sum of its proper divisors (27633863604).

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

20720847948 is a wasteful number, since it uses less digits than its factorization.

20720847948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216661 (or 216659 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 51.

The spelling of 20720847948 in words is "twenty billion, seven hundred twenty million, eight hundred forty-seven thousand, nine hundred forty-eight".