20557426158 has 32 divisors (see below), whose sum is σ = 46797397920. Its totient is φ = 6685341120.

The previous prime is 20557426133. The next prime is 20557426159. The reversal of 20557426158 is 85162475502.

20557426158 is a `hidden beast` number, since 2 + 0 + 5 + 574 + 26 + 1 + 58 = 666.

It is a super-4 number, since 4×20557426158⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20557426159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4640385 + ... + 4644812.

It is an arithmetic number, because the mean of its divisors is an integer number (1462418685).

Almost surely, 2^20557426158 is an apocalyptic number.

20557426158 is an abundant number, since it is smaller than the sum of its proper divisors (26239971762).

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

20557426158 is a wasteful number, since it uses less digits than its factorization.

20557426158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9285249 (or 9285243 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 45.

The spelling of 20557426158 in words is "twenty billion, five hundred fifty-seven million, four hundred twenty-six thousand, one hundred fifty-eight".