20345031354553 has 4 divisors (see below), whose sum is σ = 20678556458788. Its totient is φ = 20011506250320.

The previous prime is 20345031354551. The next prime is 20345031354563. The reversal of 20345031354553 is 35545313054302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4093063089424 + 16251968265129 = 2023132^2 + 4031373^2 .

It is a cyclic number.

It is not a de Polignac number, because 20345031354553 - 2¹ = 20345031354551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20345031354551) 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, 166762552026 + ... + 166762552147.

It is an arithmetic number, because the mean of its divisors is an integer number (5169639114697).

Almost surely, 2^{20345031354553} is an apocalyptic number.

It is an amenable number.

20345031354553 is a deficient number, since it is larger than the sum of its proper divisors (333525104235).

20345031354553 is an equidigital number, since it uses as much as digits as its factorization.

20345031354553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333525104234.

The product of its (nonzero) digits is 1620000, while the sum is 43.

The spelling of 20345031354553 in words is "twenty trillion, three hundred forty-five billion, thirty-one million, three hundred fifty-four thousand, five hundred fifty-three".