20455004544 has 128 divisors (see below), whose sum is σ = 58723929600. Its totient is φ = 6271174656.

The previous prime is 20455004543. The next prime is 20455004551. The reversal of 20455004544 is 44540055402.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20455004543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1405497 + ... + 1419975.

It is an arithmetic number, because the mean of its divisors is an integer number (458780700).

Almost surely, 2^20455004544 is an apocalyptic number.

20455004544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20455004544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29361964800).

20455004544 is an abundant number, since it is smaller than the sum of its proper divisors (38268925056).

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

20455004544 is a wasteful number, since it uses less digits than its factorization.

20455004544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14792 (or 14780 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 33.

Adding to 20455004544 its reverse (44540055402), we get a palindrome (64995059946).

The spelling of 20455004544 in words is "twenty billion, four hundred fifty-five million, four thousand, five hundred forty-four".