20906933 has 2 divisors, whose sum is σ = 20906934. Its totient is φ = 20906932.

The previous prime is 20906929. The next prime is 20906939. The reversal of 20906933 is 33960902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16834609 + 4072324 = 4103^2 + 2018^2 .

It is a cyclic number.

It is not a de Polignac number, because 20906933 - 2² = 20906929 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20906933.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20906939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10453466 + 10453467.

It is an arithmetic number, because the mean of its divisors is an integer number (10453467).

Almost surely, 2^20906933 is an apocalyptic number.

It is an amenable number.

20906933 is a deficient number, since it is larger than the sum of its proper divisors (1).

20906933 is an equidigital number, since it uses as much as digits as its factorization.

20906933 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 32.

The square root of 20906933 is about 4572.4099772439. The cubic root of 20906933 is about 275.4842509083.

The spelling of 20906933 in words is "twenty million, nine hundred six thousand, nine hundred thirty-three".