20506253 has 8 divisors (see below), whose sum is σ = 20811840. Its totient is φ = 20203200.

The previous prime is 20506249. The next prime is 20506261. The reversal of 20506253 is 35260502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20506253 - 2² = 20506249 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 (20506243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20501 + ... + 21477.

It is an arithmetic number, because the mean of its divisors is an integer number (2601480).

Almost surely, 2^20506253 is an apocalyptic number.

It is an amenable number.

20506253 is a deficient number, since it is larger than the sum of its proper divisors (305587).

20506253 is a wasteful number, since it uses less digits than its factorization.

20506253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 20506253 is about 4528.3830447523. The cubic root of 20506253 is about 273.7130077965.

Adding to 20506253 its reverse (35260502), we get a palindrome (55766755).

The spelling of 20506253 in words is "twenty million, five hundred six thousand, two hundred fifty-three".