20956211 has 2 divisors, whose sum is σ = 20956212. Its totient is φ = 20956210.

The previous prime is 20956181. The next prime is 20956261. The reversal of 20956211 is 11265902.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20956211 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20956261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10478105 + 10478106.

It is an arithmetic number, because the mean of its divisors is an integer number (10478106).

Almost surely, 2^20956211 is an apocalyptic number.

20956211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20956211 is an equidigital number, since it uses as much as digits as its factorization.

20956211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 20956211 is about 4577.7954301170. The cubic root of 20956211 is about 275.7005214490.

The spelling of 20956211 in words is "twenty million, nine hundred fifty-six thousand, two hundred eleven".