20128461245 has 4 divisors (see below), whose sum is σ = 24154153500. Its totient is φ = 16102768992.

The previous prime is 20128461229. The next prime is 20128461263. The reversal of 20128461245 is 54216482102.

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 12277969636 + 7850491609 = 110806^2 + 88603^2 .

It is a cyclic number.

It is not a de Polignac number, because 20128461245 - 2⁴ = 20128461229 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2012846120 + ... + 2012846129.

It is an arithmetic number, because the mean of its divisors is an integer number (6038538375).

Almost surely, 2^20128461245 is an apocalyptic number.

It is an amenable number.

20128461245 is a deficient number, since it is larger than the sum of its proper divisors (4025692255).

20128461245 is an equidigital number, since it uses as much as digits as its factorization.

20128461245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4025692254.

The product of its (nonzero) digits is 30720, while the sum is 35.

The spelling of 20128461245 in words is "twenty billion, one hundred twenty-eight million, four hundred sixty-one thousand, two hundred forty-five".