20986061 has 4 divisors (see below), whose sum is σ = 20996352. Its totient is φ = 20975772.

The previous prime is 20986057. The next prime is 20986079. The reversal of 20986061 is 16068902.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16068902 = 2 ⋅8034451.

It is a cyclic number.

It is not a de Polignac number, because 20986061 - 2² = 20986057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20986561) 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, 941 + ... + 6546.

It is an arithmetic number, because the mean of its divisors is an integer number (5249088).

Almost surely, 2^20986061 is an apocalyptic number.

It is an amenable number.

20986061 is a deficient number, since it is larger than the sum of its proper divisors (10291).

20986061 is an equidigital number, since it uses as much as digits as its factorization.

20986061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10290.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 20986061 is about 4581.0545729122. The cubic root of 20986061 is about 275.8313618351.

The spelling of 20986061 in words is "twenty million, nine hundred eighty-six thousand, sixty-one".