20981046 has 8 divisors (see below), whose sum is σ = 41962104. Its totient is φ = 6993680.

The previous prime is 20981041. The next prime is 20981047. The reversal of 20981046 is 64018902.

It is a sphenic number, since it is the product of 3 distinct primes.

20981046 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20981041) 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, 1748415 + ... + 1748426.

It is an arithmetic number, because the mean of its divisors is an integer number (5245263).

Almost surely, 2^20981046 is an apocalyptic number.

20981046 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20981046 is a wasteful number, since it uses less digits than its factorization.

20981046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3496846.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20981046 is about 4580.5071771584. The cubic root of 20981046 is about 275.8093884487.

Adding to 20981046 its reverse (64018902), we get a palindrome (84999948).

The spelling of 20981046 in words is "twenty million, nine hundred eighty-one thousand, forty-six".