20615449453 has 8 divisors (see below), whose sum is σ = 20915637696. Its totient is φ = 20315534400.

The previous prime is 20615449427. The next prime is 20615449457. The reversal of 20615449453 is 35494451602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20615449453 - 2¹³ = 20615441261 is a prime.

It is a super-2 number, since 2×20615449453² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20615449457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86250 + ... + 220612.

It is an arithmetic number, because the mean of its divisors is an integer number (2614454712).

Almost surely, 2^20615449453 is an apocalyptic number.

It is an amenable number.

20615449453 is a deficient number, since it is larger than the sum of its proper divisors (300188243).

20615449453 is a wasteful number, since it uses less digits than its factorization.

20615449453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136595.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 20615449453 in words is "twenty billion, six hundred fifteen million, four hundred forty-nine thousand, four hundred fifty-three".