20669148544 has 64 divisors (see below), whose sum is σ = 45332614800. Its totient is φ = 9308805120.

The previous prime is 20669148541. The next prime is 20669148553. The reversal of 20669148544 is 44584196602.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20669148541) 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, 86134 + ... + 220810.

Almost surely, 2^20669148544 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 20669148544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22666307400).

20669148544 is an abundant number, since it is smaller than the sum of its proper divisors (24663466256).

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

20669148544 is a wasteful number, since it uses less digits than its factorization.

20669148544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134811 (or 134799 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 49.

The spelling of 20669148544 in words is "twenty billion, six hundred sixty-nine million, one hundred forty-eight thousand, five hundred forty-four".