20964947 has 2 divisors, whose sum is σ = 20964948. Its totient is φ = 20964946.

The previous prime is 20964919. The next prime is 20964967. The reversal of 20964947 is 74946902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20964947 - 2¹⁰ = 20963923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20964917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10482473 + 10482474.

It is an arithmetic number, because the mean of its divisors is an integer number (10482474).

Almost surely, 2^20964947 is an apocalyptic number.

20964947 is a deficient number, since it is larger than the sum of its proper divisors (1).

20964947 is an equidigital number, since it uses as much as digits as its factorization.

20964947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 20964947 is about 4578.7495017745. The cubic root of 20964947 is about 275.7388264834.

It can be divided in two parts, 209 and 64947, that added together give a palindrome (65156).

The spelling of 20964947 in words is "twenty million, nine hundred sixty-four thousand, nine hundred forty-seven".