20693611 has 4 divisors (see below), whose sum is σ = 20730424. Its totient is φ = 20656800.

The previous prime is 20693609. The next prime is 20693639. The reversal of 20693611 is 11639602.

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 20693611 - 2¹ = 20693609 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 20693611.

It is not an unprimeable number, because it can be changed into a prime (20693671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17550 + ... + 18691.

It is an arithmetic number, because the mean of its divisors is an integer number (5182606).

Almost surely, 2^20693611 is an apocalyptic number.

20693611 is a deficient number, since it is larger than the sum of its proper divisors (36813).

20693611 is an equidigital number, since it uses as much as digits as its factorization.

20693611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36812.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20693611 is about 4549.0230819375. The cubic root of 20693611 is about 274.5440864467.

The spelling of 20693611 in words is "twenty million, six hundred ninety-three thousand, six hundred eleven".