20558898117 has 24 divisors (see below), whose sum is σ = 30866355520. Its totient is φ = 13674711276.

The previous prime is 20558898103. The next prime is 20558898121. The reversal of 20558898117 is 71189885502.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

20558898117 is a `hidden beast` number, since 2 + 0 + 558 + 8 + 9 + 81 + 1 + 7 = 666.

It is not a de Polignac number, because 20558898117 - 2¹² = 20558894021 is a prime.

It is a super-2 number, since 2×20558898117² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20558898817) 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 23 ways as a sum of consecutive naturals, for example, 46830984 + ... + 46831422.

Almost surely, 2^20558898117 is an apocalyptic number.

20558898117 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20558898117 is a deficient number, since it is larger than the sum of its proper divisors (10307457403).

20558898117 is an frugal number, since it uses more digits than its factorization.

20558898117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332 (or 442 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 54.

The spelling of 20558898117 in words is "twenty billion, five hundred fifty-eight million, eight hundred ninety-eight thousand, one hundred seventeen".