20557025455 has 8 divisors (see below), whose sum is σ = 24672348000. Its totient is φ = 16443008736.

The previous prime is 20557025453. The next prime is 20557025459. The reversal of 20557025455 is 55452075502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20557025455 - 2¹ = 20557025453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20557025453) 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 7 ways as a sum of consecutive naturals, for example, 291480 + ... + 355069.

It is an arithmetic number, because the mean of its divisors is an integer number (3084043500).

Almost surely, 2^20557025455 is an apocalyptic number.

20557025455 is a deficient number, since it is larger than the sum of its proper divisors (4115322545).

20557025455 is an equidigital number, since it uses as much as digits as its factorization.

20557025455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652913.

The product of its (nonzero) digits is 350000, while the sum is 40.

The spelling of 20557025455 in words is "twenty billion, five hundred fifty-seven million, twenty-five thousand, four hundred fifty-five".