20786641 has 8 divisors (see below), whose sum is σ = 21766464. Its totient is φ = 19813200.

The previous prime is 20786611. The next prime is 20786651. The reversal of 20786641 is 14668702.

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 20786641 - 2⁵ = 20786609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20786597 and 20786606.

It is not an unprimeable number, because it can be changed into a prime (20786611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5866 + ... + 8716.

It is an arithmetic number, because the mean of its divisors is an integer number (2720808).

Almost surely, 2^20786641 is an apocalyptic number.

It is an amenable number.

20786641 is a deficient number, since it is larger than the sum of its proper divisors (979823).

20786641 is a wasteful number, since it uses less digits than its factorization.

20786641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3191.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20786641 is about 4559.2368879013. The cubic root of 20786641 is about 274.9548840588.

The spelling of 20786641 in words is "twenty million, seven hundred eighty-six thousand, six hundred forty-one".