20558855 has 16 divisors (see below), whose sum is σ = 26083200. Its totient is φ = 15513120.

The previous prime is 20558843. The next prime is 20558861. The reversal of 20558855 is 55885502.

It is not a de Polignac number, because 20558855 - 2¹⁴ = 20542471 is a prime.

It is a super-2 number, since 2×20558855² = 845333037822050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35720 + ... + 36290.

It is an arithmetic number, because the mean of its divisors is an integer number (1630200).

Almost surely, 2^20558855 is an apocalyptic number.

20558855 is a deficient number, since it is larger than the sum of its proper divisors (5524345).

20558855 is a wasteful number, since it uses less digits than its factorization.

20558855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974.

The product of its (nonzero) digits is 80000, while the sum is 38.

The square root of 20558855 is about 4534.1873582815. The cubic root of 20558855 is about 273.9468479847.

The spelling of 20558855 in words is "twenty million, five hundred fifty-eight thousand, eight hundred fifty-five".