20845011 has 8 divisors (see below), whose sum is σ = 30320064. Its totient is φ = 12633320.

The previous prime is 20845007. The next prime is 20845021. The reversal of 20845011 is 11054802.

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

It is a cyclic number.

It is not a de Polignac number, because 20845011 - 2² = 20845007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20845021) 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 7 ways as a sum of consecutive naturals, for example, 315801 + ... + 315866.

It is an arithmetic number, because the mean of its divisors is an integer number (3790008).

Almost surely, 2^20845011 is an apocalyptic number.

20845011 is a deficient number, since it is larger than the sum of its proper divisors (9475053).

20845011 is a wasteful number, since it uses less digits than its factorization.

20845011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631681.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 20845011 is about 4565.6336909568. The cubic root of 20845011 is about 275.2120062127.

Adding to 20845011 its reverse (11054802), we get a palindrome (31899813).

The spelling of 20845011 in words is "twenty million, eight hundred forty-five thousand, eleven".