20994461 has 4 divisors (see below), whose sum is σ = 21006972. Its totient is φ = 20981952.

The previous prime is 20994451. The next prime is 20994509. The reversal of 20994461 is 16449902.

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 155236 + 20839225 = 394^2 + 4565^2 .

It is a cyclic number.

It is not a de Polignac number, because 20994461 - 2¹⁰ = 20993437 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 (20994451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3260 + ... + 7253.

It is an arithmetic number, because the mean of its divisors is an integer number (5251743).

Almost surely, 2^20994461 is an apocalyptic number.

It is an amenable number.

20994461 is a deficient number, since it is larger than the sum of its proper divisors (12511).

20994461 is a wasteful number, since it uses less digits than its factorization.

20994461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12510.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20994461 is about 4581.9713006522. The cubic root of 20994461 is about 275.8681588686.

It can be divided in two parts, 2099 and 4461, that multiplied together give a palindrome (9363639).

The spelling of 20994461 in words is "twenty million, nine hundred ninety-four thousand, four hundred sixty-one".