20501253 has 6 divisors (see below), whose sum is σ = 29612934. Its totient is φ = 13667496.

The previous prime is 20501237. The next prime is 20501267. The reversal of 20501253 is 35210502.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13704804 + 6796449 = 3702^2 + 2607^2 .

It is not a de Polignac number, because 20501253 - 2⁴ = 20501237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20501203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1138950 + ... + 1138967.

It is an arithmetic number, because the mean of its divisors is an integer number (4935489).

Almost surely, 2^20501253 is an apocalyptic number.

It is an amenable number.

20501253 is a deficient number, since it is larger than the sum of its proper divisors (9111681).

20501253 is a wasteful number, since it uses less digits than its factorization.

20501253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277923 (or 2277920 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20501253 is about 4527.8309376566. The cubic root of 20501253 is about 273.6907596838.

Adding to 20501253 its reverse (35210502), we get a palindrome (55711755).

The spelling of 20501253 in words is "twenty million, five hundred one thousand, two hundred fifty-three".