20641099 has 2 divisors, whose sum is σ = 20641100. Its totient is φ = 20641098.

The previous prime is 20641073. The next prime is 20641109. The reversal of 20641099 is 99014602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20641099 - 2¹⁷ = 20510027 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20641099.

It is not a weakly prime, because it can be changed into another prime (20641039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10320549 + 10320550.

It is an arithmetic number, because the mean of its divisors is an integer number (10320550).

Almost surely, 2^20641099 is an apocalyptic number.

20641099 is a deficient number, since it is larger than the sum of its proper divisors (1).

20641099 is an equidigital number, since it uses as much as digits as its factorization.

20641099 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20641099 is about 4543.2476269735. The cubic root of 20641099 is about 274.3116625196.

The spelling of 20641099 in words is "twenty million, six hundred forty-one thousand, ninety-nine".