20694961 has 8 divisors (see below), whose sum is σ = 23684480. Its totient is φ = 17713728.

The previous prime is 20694943. The next prime is 20694979. The reversal of 20694961 is 16949602.

20694961 is a nontrivial binomial coefficient, being equal to C(6434, 2).

It is an interprime number because it is at equal distance from previous prime (20694943) and next prime (20694979).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20694961 - 2⁹ = 20694449 is a prime.

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 20694961.

It is not an unprimeable number, because it can be changed into a prime (20694901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4825 + ... + 8041.

It is an arithmetic number, because the mean of its divisors is an integer number (2960560).

Almost surely, 2^20694961 is an apocalyptic number.

20694961 is the 6433-rd triangular number and also the 3217-th hexagonal number.

20694961 is the 2145-th centered nonagonal number.

It is an amenable number.

20694961 is a deficient number, since it is larger than the sum of its proper divisors (2989519).

20694961 is an equidigital number, since it uses as much as digits as its factorization.

20694961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4143.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 20694961 is about 4549.1714630249. The cubic root of 20694961 is about 274.5500565093.

The spelling of 20694961 in words is "twenty million, six hundred ninety-four thousand, nine hundred sixty-one".