20315253 has 24 divisors (see below), whose sum is σ = 31814208. Its totient is φ = 11496576.

The previous prime is 20315227. The next prime is 20315263. The reversal of 20315253 is 35251302.

It is not a de Polignac number, because 20315253 - 2⁶ = 20315189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16000 + ... + 17222.

It is an arithmetic number, because the mean of its divisors is an integer number (1325592).

Almost surely, 2^20315253 is an apocalyptic number.

It is an amenable number.

20315253 is a deficient number, since it is larger than the sum of its proper divisors (11498955).

20315253 is a wasteful number, since it uses less digits than its factorization.

20315253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353 (or 1346 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 20315253 is about 4507.2445019102. The cubic root of 20315253 is about 272.8605467914.

Adding to 20315253 its reverse (35251302), we get a palindrome (55566555).

The spelling of 20315253 in words is "twenty million, three hundred fifteen thousand, two hundred fifty-three".