20617543445 has 8 divisors (see below), whose sum is σ = 24796157400. Its totient is φ = 16457297920.

The previous prime is 20617543423. The next prime is 20617543483. The reversal of 20617543445 is 54434571602.

It can be written as a sum of positive squares in 4 ways, for example, as 3983250769 + 16634292676 = 63113^2 + 128974^2 .

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

It is not a de Polignac number, because 20617543445 - 2³⁰ = 19543801621 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4589636 + ... + 4594125.

It is an arithmetic number, because the mean of its divisors is an integer number (3099519675).

Almost surely, 2^20617543445 is an apocalyptic number.

It is an amenable number.

20617543445 is a deficient number, since it is larger than the sum of its proper divisors (4178613955).

20617543445 is an equidigital number, since it uses as much as digits as its factorization.

20617543445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9184215.

The product of its (nonzero) digits is 403200, while the sum is 41.

The spelling of 20617543445 in words is "twenty billion, six hundred seventeen million, five hundred forty-three thousand, four hundred forty-five".