20151253 has 4 divisors (see below), whose sum is σ = 20215948. Its totient is φ = 20086560.

The previous prime is 20151251. The next prime is 20151277. The reversal of 20151253 is 35215102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5726449 + 14424804 = 2393^2 + 3798^2 .

It is a cyclic number.

It is not a de Polignac number, because 20151253 - 2¹ = 20151251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20151253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20151251) 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, 31878 + ... + 32503.

It is an arithmetic number, because the mean of its divisors is an integer number (5053987).

Almost surely, 2^20151253 is an apocalyptic number.

It is an amenable number.

20151253 is a deficient number, since it is larger than the sum of its proper divisors (64695).

20151253 is an equidigital number, since it uses as much as digits as its factorization.

20151253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64694.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 20151253 is about 4489.0147025823. The cubic root of 20151253 is about 272.1243169111.

Adding to 20151253 its reverse (35215102), we get a palindrome (55366355).

The spelling of 20151253 in words is "twenty million, one hundred fifty-one thousand, two hundred fifty-three".