20942911 has 8 divisors (see below), whose sum is σ = 22904784. Its totient is φ = 18990720.

The previous prime is 20942899. The next prime is 20942917. The reversal of 20942911 is 11924902.

It is a happy number.

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 20942911 - 2⁷ = 20942783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20942911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20942917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2565 + ... + 6961.

It is an arithmetic number, because the mean of its divisors is an integer number (2863098).

Almost surely, 2^20942911 is an apocalyptic number.

20942911 is a deficient number, since it is larger than the sum of its proper divisors (1961873).

20942911 is a wasteful number, since it uses less digits than its factorization.

20942911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4841.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 20942911 is about 4576.3425352567. The cubic root of 20942911 is about 275.6421840435.

Subtracting from 20942911 its reverse (11924902), we obtain a square (9018009 = 3003²).

It can be divided in two parts, 2094 and 2911, that added together give a palindrome (5005).

The spelling of 20942911 in words is "twenty million, nine hundred forty-two thousand, nine hundred eleven".