20536253 has 4 divisors (see below), whose sum is σ = 20825568. Its totient is φ = 20246940.

The previous prime is 20536231. The next prime is 20536279. The reversal of 20536253 is 35263502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35263502 = 2 ⋅17631751.

It is a cyclic number.

It is not a de Polignac number, because 20536253 - 2¹² = 20532157 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 (20536213) 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, 144551 + ... + 144692.

It is an arithmetic number, because the mean of its divisors is an integer number (5206392).

Almost surely, 2^20536253 is an apocalyptic number.

It is an amenable number.

20536253 is a deficient number, since it is larger than the sum of its proper divisors (289315).

20536253 is an equidigital number, since it uses as much as digits as its factorization.

20536253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289314.

The product of its (nonzero) digits is 5400, while the sum is 26.

The square root of 20536253 is about 4531.6942747719. The cubic root of 20536253 is about 273.8464205845.

Adding to 20536253 its reverse (35263502), we get a palindrome (55799755).

The spelling of 20536253 in words is "twenty million, five hundred thirty-six thousand, two hundred fifty-three".