20453531449 has 8 divisors (see below), whose sum is σ = 22039217480. Its totient is φ = 18869607936.

The previous prime is 20453531437. The next prime is 20453531507. The reversal of 20453531449 is 94413535402.

It can be written as a sum of positive squares in 4 ways, for example, as 7457531449 + 12996000000 = 86357^2 + 114000^2 .

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 20453531449 - 2²⁹ = 19916660537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20453531849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 416472 + ... + 462985.

It is an arithmetic number, because the mean of its divisors is an integer number (2754902185).

Almost surely, 2^20453531449 is an apocalyptic number.

It is an amenable number.

20453531449 is a deficient number, since it is larger than the sum of its proper divisors (1585686031).

20453531449 is a wasteful number, since it uses less digits than its factorization.

20453531449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881259.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 20453531449 in words is "twenty billion, four hundred fifty-three million, five hundred thirty-one thousand, four hundred forty-nine".