20454644553 has 32 divisors (see below), whose sum is σ = 31277875200. Its totient is φ = 11647613376.

The previous prime is 20454644531. The next prime is 20454644591. The reversal of 20454644553 is 35544645402.

It is a happy number.

It is not a de Polignac number, because 20454644553 - 2²² = 20450450249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20454644753) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14313243 + ... + 14314671.

It is an arithmetic number, because the mean of its divisors is an integer number (977433600).

Almost surely, 2^20454644553 is an apocalyptic number.

It is an amenable number.

20454644553 is a deficient number, since it is larger than the sum of its proper divisors (10823230647).

20454644553 is a wasteful number, since it uses less digits than its factorization.

20454644553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3341.

The product of its (nonzero) digits is 1152000, while the sum is 42.

The spelling of 20454644553 in words is "twenty billion, four hundred fifty-four million, six hundred forty-four thousand, five hundred fifty-three".