20451513104 has 80 divisors (see below), whose sum is σ = 43546230720. Its totient is φ = 9227796480.

The previous prime is 20451513101. The next prime is 20451513107. The reversal of 20451513104 is 40131515402.

It is an interprime number because it is at equal distance from previous prime (20451513101) and next prime (20451513107).

It is not an unprimeable number, because it can be changed into a prime (20451513101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17142332 + ... + 17143524.

It is an arithmetic number, because the mean of its divisors is an integer number (544327884).

Almost surely, 2^20451513104 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 20451513104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21773115360).

20451513104 is an abundant number, since it is smaller than the sum of its proper divisors (23094717616).

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

20451513104 is a wasteful number, since it uses less digits than its factorization.

20451513104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1848 (or 1842 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The spelling of 20451513104 in words is "twenty billion, four hundred fifty-one million, five hundred thirteen thousand, one hundred four".