20495887480 has 128 divisors (see below), whose sum is σ = 51548270400. Its totient is φ = 7288676352.

The previous prime is 20495887403. The next prime is 20495887487. The reversal of 20495887480 is 8478859402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20495887487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4817034 + ... + 4821286.

Almost surely, 2^20495887480 is an apocalyptic number.

20495887480 is a gapful number since it is divisible by the number (20) 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 20495887480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25774135200).

20495887480 is an abundant number, since it is smaller than the sum of its proper divisors (31052382920).

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

20495887480 is a wasteful number, since it uses less digits than its factorization.

20495887480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4673 (or 4669 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 55.

The spelling of 20495887480 in words is "twenty billion, four hundred ninety-five million, eight hundred eighty-seven thousand, four hundred eighty".