20850911 has 4 divisors (see below), whose sum is σ = 20991000. Its totient is φ = 20710824.

The previous prime is 20850901. The next prime is 20850931. The reversal of 20850911 is 11905802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11905802 = 2 ⋅5952901.

It is a cyclic number.

It is not a de Polignac number, because 20850911 - 2¹⁸ = 20588767 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 (20850901) 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, 69821 + ... + 70118.

It is an arithmetic number, because the mean of its divisors is an integer number (5247750).

Almost surely, 2^20850911 is an apocalyptic number.

20850911 is a deficient number, since it is larger than the sum of its proper divisors (140089).

20850911 is a wasteful number, since it uses less digits than its factorization.

20850911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140088.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 20850911 is about 4566.2797767986. The cubic root of 20850911 is about 275.2379692223.

The spelling of 20850911 in words is "twenty million, eight hundred fifty thousand, nine hundred eleven".