20208858 has 24 divisors (see below), whose sum is σ = 42258048. Its totient is φ = 6442392.

The previous prime is 20208833. The next prime is 20208863. The reversal of 20208858 is 85880202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10 + ... + 6357.

It is an arithmetic number, because the mean of its divisors is an integer number (1760752).

Almost surely, 2^20208858 is an apocalyptic number.

20208858 is an abundant number, since it is smaller than the sum of its proper divisors (22049190).

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

20208858 is a wasteful number, since it uses less digits than its factorization.

20208858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6418 (or 6395 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 33.

The square root of 20208858 is about 4495.4263424062. The cubic root of 20208858 is about 272.3833712392.

It can be divided in two parts, 2020 and 8858, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 20208858 in words is "twenty million, two hundred eight thousand, eight hundred fifty-eight".