20312653 has 4 divisors (see below), whose sum is σ = 21381760. Its totient is φ = 19243548.

The previous prime is 20312639. The next prime is 20312681. The reversal of 20312653 is 35621302.

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.

It is a cyclic number.

It is not a de Polignac number, because 20312653 - 2¹³ = 20304461 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 (20312623) 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, 534525 + ... + 534562.

It is an arithmetic number, because the mean of its divisors is an integer number (5345440).

Almost surely, 2^20312653 is an apocalyptic number.

It is an amenable number.

20312653 is a deficient number, since it is larger than the sum of its proper divisors (1069107).

20312653 is a wasteful number, since it uses less digits than its factorization.

20312653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069106.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 20312653 is about 4506.9560681240. The cubic root of 20312653 is about 272.8489058225.

Adding to 20312653 its reverse (35621302), we get a palindrome (55933955).

The spelling of 20312653 in words is "twenty million, three hundred twelve thousand, six hundred fifty-three".