20802253 has 4 divisors (see below), whose sum is σ = 20815488. Its totient is φ = 20789020.

The previous prime is 20802233. The next prime is 20802269. The reversal of 20802253 is 35220802.

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: 35220802 = 2 ⋅17610401.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20802253 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20802233) 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, 3883 + ... + 7528.

It is an arithmetic number, because the mean of its divisors is an integer number (5203872).

Almost surely, 2^20802253 is an apocalyptic number.

It is an amenable number.

20802253 is a deficient number, since it is larger than the sum of its proper divisors (13235).

20802253 is a wasteful number, since it uses less digits than its factorization.

20802253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13234.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20802253 is about 4560.9486951730. The cubic root of 20802253 is about 275.0237026402.

The spelling of 20802253 in words is "twenty million, eight hundred two thousand, two hundred fifty-three".