20706858 has 24 divisors (see below), whose sum is σ = 45037668. Its totient is φ = 6875712.

The previous prime is 20706823. The next prime is 20706869. The reversal of 20706858 is 85860702.

It can be written as a sum of positive squares in 2 ways, for example, as 15657849 + 5049009 = 3957^2 + 2247^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2910 + ... + 7062.

Almost surely, 2^20706858 is an apocalyptic number.

20706858 is an abundant number, since it is smaller than the sum of its proper divisors (24330810).

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

20706858 is a wasteful number, since it uses less digits than its factorization.

20706858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4438 (or 4435 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 20706858 is about 4550.4788758987. The cubic root of 20706858 is about 274.6026570162.

The spelling of 20706858 in words is "twenty million, seven hundred six thousand, eight hundred fifty-eight".