20136653 has 6 divisors (see below), whose sum is σ = 21391146. Its totient is φ = 18951872.

The previous prime is 20136631. The next prime is 20136659. The reversal of 20136653 is 35663102.

It can be written as a sum of positive squares in 3 ways, for example, as 2184484 + 17952169 = 1478^2 + 4237^2 .

It is not a de Polignac number, because 20136653 - 2¹⁰ = 20135629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20136659) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34550 + ... + 35127.

It is an arithmetic number, because the mean of its divisors is an integer number (3565191).

Almost surely, 2^20136653 is an apocalyptic number.

It is an amenable number.

20136653 is a deficient number, since it is larger than the sum of its proper divisors (1254493).

20136653 is an equidigital number, since it uses as much as digits as its factorization.

20136653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69711 (or 69694 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 20136653 is about 4487.3882158779. The cubic root of 20136653 is about 272.0585811324.

Adding to 20136653 its reverse (35663102), we get a palindrome (55799755).

The spelling of 20136653 in words is "twenty million, one hundred thirty-six thousand, six hundred fifty-three".