20388317545 has 8 divisors (see below), whose sum is σ = 24483705480. Its totient is φ = 16298837760.

The previous prime is 20388317539. The next prime is 20388317567. The reversal of 20388317545 is 54571388302.

It can be written as a sum of positive squares in 4 ways, for example, as 134189056 + 20254128489 = 11584^2 + 142317^2 .

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

It is not a de Polignac number, because 20388317545 - 2⁵ = 20388317513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20388317495 and 20388317504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1469440 + ... + 1483249.

It is an arithmetic number, because the mean of its divisors is an integer number (3060463185).

Almost surely, 2^20388317545 is an apocalyptic number.

It is an amenable number.

20388317545 is a deficient number, since it is larger than the sum of its proper divisors (4095387935).

20388317545 is a wasteful number, since it uses less digits than its factorization.

20388317545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2954075.

The product of its (nonzero) digits is 806400, while the sum is 46.

The spelling of 20388317545 in words is "twenty billion, three hundred eighty-eight million, three hundred seventeen thousand, five hundred forty-five".