20516850 has 72 divisors (see below), whose sum is σ = 55710720. Its totient is φ = 5412960.

The previous prime is 20516849. The next prime is 20516861. The reversal of 20516850 is 5861502.

It is a super-2 number, since 2×20516850² = 841882267845000, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 56971 + ... + 57329.

It is an arithmetic number, because the mean of its divisors is an integer number (773760).

Almost surely, 2^20516850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20516850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27855360).

20516850 is an abundant number, since it is smaller than the sum of its proper divisors (35193870).

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

20516850 is a wasteful number, since it uses less digits than its factorization.

20516850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504 (or 496 counting only the distinct ones).

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

The square root of 20516850 is about 4529.5529580743. The cubic root of 20516850 is about 273.7601484947.

The spelling of 20516850 in words is "twenty million, five hundred sixteen thousand, eight hundred fifty".