20986741 has 4 divisors (see below), whose sum is σ = 21899232. Its totient is φ = 20074252.

The previous prime is 20986729. The next prime is 20986747. The reversal of 20986741 is 14768902.

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 an emirpimes, since its reverse is a distinct semiprime: 14768902 = 2 ⋅7384451.

It is a cyclic number.

It is not a de Polignac number, because 20986741 - 2⁷ = 20986613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20986741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20986747) 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, 456211 + ... + 456256.

It is an arithmetic number, because the mean of its divisors is an integer number (5474808).

Almost surely, 2^20986741 is an apocalyptic number.

It is an amenable number.

20986741 is a deficient number, since it is larger than the sum of its proper divisors (912491).

20986741 is an equidigital number, since it uses as much as digits as its factorization.

20986741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912490.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 20986741 is about 4581.1287910296. The cubic root of 20986741 is about 275.8343410078.

The spelling of 20986741 in words is "twenty million, nine hundred eighty-six thousand, seven hundred forty-one".