20690611 has 4 divisors (see below), whose sum is σ = 21171832. Its totient is φ = 20209392.

The previous prime is 20690603. The next prime is 20690641. The reversal of 20690611 is 11609602.

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 20690611 - 2³ = 20690603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20690641) 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, 240546 + ... + 240631.

It is an arithmetic number, because the mean of its divisors is an integer number (5292958).

Almost surely, 2^20690611 is an apocalyptic number.

20690611 is a deficient number, since it is larger than the sum of its proper divisors (481221).

20690611 is an equidigital number, since it uses as much as digits as its factorization.

20690611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481220.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 20690611 is about 4548.6933288583. The cubic root of 20690611 is about 274.5308187114.

The spelling of 20690611 in words is "twenty million, six hundred ninety thousand, six hundred eleven".