20966963 has 4 divisors (see below), whose sum is σ = 20985000. Its totient is φ = 20948928.

The previous prime is 20966951. The next prime is 20966969. The reversal of 20966963 is 36966902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20966963 - 2⁸ = 20966707 is a prime.

It is a super-2 number, since 2×20966963² = 879227074886738, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20966963.

It is not an unprimeable number, because it can be changed into a prime (20966969) 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 in 3 ways as a sum of consecutive naturals, for example, 7145 + ... + 9642.

It is an arithmetic number, because the mean of its divisors is an integer number (5246250).

Almost surely, 2^20966963 is an apocalyptic number.

20966963 is a deficient number, since it is larger than the sum of its proper divisors (18037).

20966963 is a wasteful number, since it uses less digits than its factorization.

20966963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18036.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 20966963 is about 4578.9696439265. The cubic root of 20966963 is about 275.7476645956.

The spelling of 20966963 in words is "twenty million, nine hundred sixty-six thousand, nine hundred sixty-three".