20513445104 has 80 divisors (see below), whose sum is σ = 41611220640. Its totient is φ = 9784320000.

The previous prime is 20513445053. The next prime is 20513445143. The reversal of 20513445104 is 40154431502.

It is a Harshad number since it is a multiple of its sum of digits (29).

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, 17079704 + ... + 17080904.

It is an arithmetic number, because the mean of its divisors is an integer number (520140258).

Almost surely, 2^20513445104 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 20513445104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20805610320).

20513445104 is an abundant number, since it is smaller than the sum of its proper divisors (21097775536).

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

20513445104 is a wasteful number, since it uses less digits than its factorization.

20513445104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650 (or 1644 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 20513445104 its reverse (40154431502), we get a palindrome (60667876606).

The spelling of 20513445104 in words is "twenty billion, five hundred thirteen million, four hundred forty-five thousand, one hundred four".