20850861 has 8 divisors (see below), whose sum is σ = 27828864. Its totient is φ = 13886720.

The previous prime is 20850853. The next prime is 20850871. The reversal of 20850861 is 16805802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20850861 - 2³ = 20850853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20850871) 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 7 ways as a sum of consecutive naturals, for example, 796 + ... + 6506.

It is an arithmetic number, because the mean of its divisors is an integer number (3478608).

Almost surely, 2^20850861 is an apocalyptic number.

It is an amenable number.

20850861 is a deficient number, since it is larger than the sum of its proper divisors (6978003).

20850861 is a wasteful number, since it uses less digits than its factorization.

20850861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6931.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 20850861 is about 4566.2743018789. The cubic root of 20850861 is about 275.2377492174.

The spelling of 20850861 in words is "twenty million, eight hundred fifty thousand, eight hundred sixty-one".