20068861 has 4 divisors (see below), whose sum is σ = 20129824. Its totient is φ = 20007900.

The previous prime is 20068849. The next prime is 20068871. The reversal of 20068861 is 16886002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20068861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20068871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29985 + ... + 30646.

It is an arithmetic number, because the mean of its divisors is an integer number (5032456).

Almost surely, 2^20068861 is an apocalyptic number.

It is an amenable number.

20068861 is a deficient number, since it is larger than the sum of its proper divisors (60963).

20068861 is an equidigital number, since it uses as much as digits as its factorization.

20068861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60962.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 20068861 is about 4479.8282333143. The cubic root of 20068861 is about 271.7529339908.

The spelling of 20068861 in words is "twenty million, sixty-eight thousand, eight hundred sixty-one".