20966951 has 2 divisors, whose sum is σ = 20966952. Its totient is φ = 20966950.

The previous prime is 20966923. The next prime is 20966969. The reversal of 20966951 is 15966902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20966951 is a prime.

It is a super-2 number, since 2×20966951² = 879226068472802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20966921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10483475 + 10483476.

It is an arithmetic number, because the mean of its divisors is an integer number (10483476).

Almost surely, 2^20966951 is an apocalyptic number.

20966951 is a deficient number, since it is larger than the sum of its proper divisors (1).

20966951 is an equidigital number, since it uses as much as digits as its factorization.

20966951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 20966951 is about 4578.9683335878. The cubic root of 20966951 is about 275.7476119894.

The spelling of 20966951 in words is "twenty million, nine hundred sixty-six thousand, nine hundred fifty-one".