20557537080 has 128 divisors (see below), whose sum is σ = 64410163200. Its totient is φ = 5239089152.

The previous prime is 20557537073. The next prime is 20557537087. The reversal of 20557537080 is 8073575502.

It is an interprime number because it is at equal distance from previous prime (20557537073) and next prime (20557537087).

It is a super-2 number, since 2×20557537080² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20557537087) 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, 4101616 + ... + 4106624.

It is an arithmetic number, because the mean of its divisors is an integer number (503204400).

Almost surely, 2^20557537080 is an apocalyptic number.

20557537080 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 20557537080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32205081600).

20557537080 is an abundant number, since it is smaller than the sum of its proper divisors (43852626120).

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

20557537080 is a wasteful number, since it uses less digits than its factorization.

20557537080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6533 (or 6529 counting only the distinct ones).

The product of its (nonzero) digits is 294000, while the sum is 42.

The spelling of 20557537080 in words is "twenty billion, five hundred fifty-seven million, five hundred thirty-seven thousand, eighty".