20613948672 has 144 divisors (see below), whose sum is σ = 58658221440. Its totient is φ = 6403915776.

The previous prime is 20613948643. The next prime is 20613948683. The reversal of 20613948672 is 27684931602.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1337104 + ... + 1352432.

It is an arithmetic number, because the mean of its divisors is an integer number (407348760).

Almost surely, 2^20613948672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20613948672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29329110720).

20613948672 is an abundant number, since it is smaller than the sum of its proper divisors (38044272768).

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

20613948672 is a wasteful number, since it uses less digits than its factorization.

20613948672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15468 (or 15454 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 20613948672 in words is "twenty billion, six hundred thirteen million, nine hundred forty-eight thousand, six hundred seventy-two".