20557025540 has 24 divisors (see below), whose sum is σ = 43551791640. Its totient is φ = 8150041088.

The previous prime is 20557025513. The next prime is 20557025569. The reversal of 20557025540 is 4552075502.

It can be written as a sum of positive squares in 4 ways, for example, as 410629696 + 20146395844 = 20264^2 + 141938^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20557025540.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4545755 + ... + 4550274.

It is an arithmetic number, because the mean of its divisors is an integer number (1814657985).

Almost surely, 2^20557025540 is an apocalyptic number.

20557025540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20557025540 is an abundant number, since it is smaller than the sum of its proper divisors (22994766100).

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

20557025540 is a wasteful number, since it uses less digits than its factorization.

20557025540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9096151 (or 9096149 counting only the distinct ones).

The product of its (nonzero) digits is 70000, while the sum is 35.

The spelling of 20557025540 in words is "twenty billion, five hundred fifty-seven million, twenty-five thousand, five hundred forty".