20635091 has 2 divisors, whose sum is σ = 20635092. Its totient is φ = 20635090.

The previous prime is 20635081. The next prime is 20635103. The reversal of 20635091 is 19053602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20635091 - 2¹⁰ = 20634067 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 20635091.

It is not a weakly prime, because it can be changed into another prime (20635031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10317545 + 10317546.

It is an arithmetic number, because the mean of its divisors is an integer number (10317546).

Almost surely, 2^20635091 is an apocalyptic number.

20635091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20635091 is an equidigital number, since it uses as much as digits as its factorization.

20635091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 20635091 is about 4542.5863778249. The cubic root of 20635091 is about 274.2850453259.

Adding to 20635091 its reverse (19053602), we get a palindrome (39688693).

The spelling of 20635091 in words is "twenty million, six hundred thirty-five thousand, ninety-one".