20642850 has 72 divisors (see below), whose sum is σ = 57548400. Its totient is φ = 5501520.

The previous prime is 20642837. The next prime is 20642851. The reversal of 20642850 is 5824602.

It is a super-2 number, since 2×20642850² = 852254512245000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20642851) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 11301 + ... + 12999.

Almost surely, 2^20642850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20642850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28774200).

20642850 is an abundant number, since it is smaller than the sum of its proper divisors (36905550).

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

20642850 is a wasteful number, since it uses less digits than its factorization.

20642850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1726 (or 1709 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20642850 is about 4543.4403264487. The cubic root of 20642850 is about 274.3194189887.

The spelling of 20642850 in words is "twenty million, six hundred forty-two thousand, eight hundred fifty".