20165850 has 72 divisors (see below), whose sum is σ = 55551132. Its totient is φ = 5241600.

The previous prime is 20165843. The next prime is 20165857. The reversal of 20165850 is 5856102.

20165850 is a `hidden beast` number, since 2 + 0 + 1 + 658 + 5 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (20165843) and next prime (20165857).

It can be written as a sum of positive squares in 6 ways, for example, as 8242641 + 11923209 = 2871^2 + 3453^2 .

It is not an unprimeable number, because it can be changed into a prime (20165857) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17904 + ... + 18996.

Almost surely, 2^20165850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20165850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27775566).

20165850 is an abundant number, since it is smaller than the sum of its proper divisors (35385282).

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

20165850 is a wasteful number, since it uses less digits than its factorization.

20165850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152 (or 1144 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 20165850 is about 4490.6402661536. The cubic root of 20165850 is about 272.1900074486.

The spelling of 20165850 in words is "twenty million, one hundred sixty-five thousand, eight hundred fifty".