20805850 has 24 divisors (see below), whose sum is σ = 41677020. Its totient is φ = 7681920.

The previous prime is 20805791. The next prime is 20805853. The reversal of 20805850 is 5850802.

It can be written as a sum of positive squares in 6 ways, for example, as 94249 + 20711601 = 307^2 + 4551^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20805853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15355 + ... + 16654.

Almost surely, 2^20805850 is an apocalyptic number.

20805850 is an abundant number, since it is smaller than the sum of its proper divisors (20871170).

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

20805850 is a wasteful number, since it uses less digits than its factorization.

20805850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32034 (or 32029 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 20805850 is about 4561.3430039847. The cubic root of 20805850 is about 275.0395535394.

The spelling of 20805850 in words is "twenty million, eight hundred five thousand, eight hundred fifty".