20942951 has 2 divisors, whose sum is σ = 20942952. Its totient is φ = 20942950.

The previous prime is 20942917. The next prime is 20943007. The reversal of 20942951 is 15924902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20942951 - 2¹⁰ = 20941927 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20944951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10471475 + 10471476.

It is an arithmetic number, because the mean of its divisors is an integer number (10471476).

Almost surely, 2^20942951 is an apocalyptic number.

20942951 is a deficient number, since it is larger than the sum of its proper divisors (1).

20942951 is an equidigital number, since it uses as much as digits as its factorization.

20942951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 20942951 is about 4576.3469055569. The cubic root of 20942951 is about 275.6423595314.

The spelling of 20942951 in words is "twenty million, nine hundred forty-two thousand, nine hundred fifty-one".