20303461645 has 8 divisors (see below), whose sum is σ = 24367141656. Its totient is φ = 16240777536.

The previous prime is 20303461639. The next prime is 20303461649. The reversal of 20303461645 is 54616430302.

It can be written as a sum of positive squares in 4 ways, for example, as 4265265481 + 16038196164 = 65309^2 + 126642^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20303461645 - 2⁷ = 20303461517 is a prime.

It is a super-3 number, since 3×20303461645³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20303461645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303461649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203362 + ... + 286291.

It is an arithmetic number, because the mean of its divisors is an integer number (3045892707).

Almost surely, 2^20303461645 is an apocalyptic number.

It is an amenable number.

20303461645 is a deficient number, since it is larger than the sum of its proper divisors (4063680011).

20303461645 is an equidigital number, since it uses as much as digits as its factorization.

20303461645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497951.

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 20303461645 its reverse (54616430302), we get a palindrome (74919891947).

The spelling of 20303461645 in words is "twenty billion, three hundred three million, four hundred sixty-one thousand, six hundred forty-five".