20967901 has 2 divisors, whose sum is σ = 20967902. Its totient is φ = 20967900.

The previous prime is 20967883. The next prime is 20967911. The reversal of 20967901 is 10976902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19131876 + 1836025 = 4374^2 + 1355^2 .

It is a cyclic number.

It is not a de Polignac number, because 20967901 - 2⁹ = 20967389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20967911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10483950 + 10483951.

It is an arithmetic number, because the mean of its divisors is an integer number (10483951).

Almost surely, 2^20967901 is an apocalyptic number.

It is an amenable number.

20967901 is a deficient number, since it is larger than the sum of its proper divisors (1).

20967901 is an equidigital number, since it uses as much as digits as its factorization.

20967901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 20967901 is about 4579.0720675700. The cubic root of 20967901 is about 275.7517765796.

Subtracting from 20967901 its reverse (10976902), we obtain a palindrome (9990999).

The spelling of 20967901 in words is "twenty million, nine hundred sixty-seven thousand, nine hundred one".