20982061 has 4 divisors (see below), whose sum is σ = 22086400. Its totient is φ = 19877724.

The previous prime is 20982053. The next prime is 20982067. The reversal of 20982061 is 16028902.

It is a happy number.

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 not a de Polignac number, because 20982061 - 2³ = 20982053 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 (20982067) 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, 552141 + ... + 552178.

It is an arithmetic number, because the mean of its divisors is an integer number (5521600).

Almost surely, 2^20982061 is an apocalyptic number.

It is an amenable number.

20982061 is a deficient number, since it is larger than the sum of its proper divisors (1104339).

20982061 is a wasteful number, since it uses less digits than its factorization.

20982061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104338.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20982061 is about 4580.6179714095. The cubic root of 20982061 is about 275.8138359869.

It can be divided in two parts, 20 and 982061, that added together give a square (982081 = 991²).

The spelling of 20982061 in words is "twenty million, nine hundred eighty-two thousand, sixty-one".