20557155481 has 8 divisors (see below), whose sum is σ = 20773821024. Its totient is φ = 20341395360.

The previous prime is 20557155461. The next prime is 20557155529. The reversal of 20557155481 is 18455175502.

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 20557155481 - 2⁵ = 20557155449 is a prime.

It is a super-2 number, since 2×20557155481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20557155401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180660 + ... + 271573.

It is an arithmetic number, because the mean of its divisors is an integer number (2596727628).

Almost surely, 2^20557155481 is an apocalyptic number.

It is an amenable number.

20557155481 is a deficient number, since it is larger than the sum of its proper divisors (216665543).

20557155481 is a wasteful number, since it uses less digits than its factorization.

20557155481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452711.

The product of its (nonzero) digits is 280000, while the sum is 43.

The spelling of 20557155481 in words is "twenty billion, five hundred fifty-seven million, one hundred fifty-five thousand, four hundred eighty-one".