20694691 has 2 divisors, whose sum is σ = 20694692. Its totient is φ = 20694690.

The previous prime is 20694683. The next prime is 20694703. The reversal of 20694691 is 19649602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20694691 - 2³ = 20694683 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20694691.

It is not a weakly prime, because it can be changed into another prime (20694601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10347345 + 10347346.

It is an arithmetic number, because the mean of its divisors is an integer number (10347346).

Almost surely, 2^20694691 is an apocalyptic number.

20694691 is a deficient number, since it is larger than the sum of its proper divisors (1).

20694691 is an equidigital number, since it uses as much as digits as its factorization.

20694691 is an evil number, because the sum of its binary digits is even.

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

The square root of 20694691 is about 4549.1417871946. The cubic root of 20694691 is about 274.5488625176.

The spelling of 20694691 in words is "twenty million, six hundred ninety-four thousand, six hundred ninety-one".