20683861 has 12 divisors (see below), whose sum is σ = 22876000. Its totient is φ = 18687240.

The previous prime is 20683853. The next prime is 20683879. The reversal of 20683861 is 16838602.

It is not a de Polignac number, because 20683861 - 2³ = 20683853 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 (20683801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23650 + ... + 24508.

Almost surely, 2^20683861 is an apocalyptic number.

It is an amenable number.

20683861 is a deficient number, since it is larger than the sum of its proper divisors (2192139).

20683861 is a wasteful number, since it uses less digits than its factorization.

20683861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080 (or 1069 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20683861 is about 4547.9512970128. The cubic root of 20683861 is about 274.5009616170.

It can be divided in two parts, 2068 and 3861, that added together give a square (5929 = 77²).

The spelling of 20683861 in words is "twenty million, six hundred eighty-three thousand, eight hundred sixty-one".