20662841 has 4 divisors (see below), whose sum is σ = 20845812. Its totient is φ = 20479872.

The previous prime is 20662801. The next prime is 20662847. The reversal of 20662841 is 14826602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6943225 + 13719616 = 2635^2 + 3704^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20662841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20662847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91316 + ... + 91541.

It is an arithmetic number, because the mean of its divisors is an integer number (5211453).

Almost surely, 2^20662841 is an apocalyptic number.

It is an amenable number.

20662841 is a deficient number, since it is larger than the sum of its proper divisors (182971).

20662841 is a wasteful number, since it uses less digits than its factorization.

20662841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182970.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20662841 is about 4545.6397789530. The cubic root of 20662841 is about 274.4079427828.

It can be divided in two parts, 206628 and 41, that multiplied together give a palindrome (8471748).

The spelling of 20662841 in words is "twenty million, six hundred sixty-two thousand, eight hundred forty-one".