20669611 has 2 divisors, whose sum is σ = 20669612. Its totient is φ = 20669610.

The previous prime is 20669563. The next prime is 20669641. The reversal of 20669611 is 11696602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20669611 - 2¹³ = 20661419 is a prime.

It is not a weakly prime, because it can be changed into another prime (20669641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10334805 + 10334806.

It is an arithmetic number, because the mean of its divisors is an integer number (10334806).

Almost surely, 2^20669611 is an apocalyptic number.

20669611 is a deficient number, since it is larger than the sum of its proper divisors (1).

20669611 is an equidigital number, since it uses as much as digits as its factorization.

20669611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 20669611 is about 4546.3843876206. The cubic root of 20669611 is about 274.4379086350.

The spelling of 20669611 in words is "twenty million, six hundred sixty-nine thousand, six hundred eleven".