20615213015453 has 4 divisors (see below), whose sum is σ = 23560243446240. Its totient is φ = 17670182584668.

The previous prime is 20615213015429. The next prime is 20615213015503. The reversal of 20615213015453 is 35451031251602.

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 20615213015453 - 2⁸ = 20615213015197 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 (20615213015413) 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, 1472515215383 + ... + 1472515215396.

It is an arithmetic number, because the mean of its divisors is an integer number (5890060861560).

Almost surely, 2^{20615213015453} is an apocalyptic number.

It is an amenable number.

20615213015453 is a deficient number, since it is larger than the sum of its proper divisors (2945030430787).

20615213015453 is an equidigital number, since it uses as much as digits as its factorization.

20615213015453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2945030430786.

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 20615213015453 in words is "twenty trillion, six hundred fifteen billion, two hundred thirteen million, fifteen thousand, four hundred fifty-three".