20653431145 has 8 divisors (see below), whose sum is σ = 25204187520. Its totient is φ = 16242698160.

The previous prime is 20653431137. The next prime is 20653431173. The reversal of 20653431145 is 54113435602.

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

It is not a de Polignac number, because 20653431145 - 2³ = 20653431137 is a prime.

It is a super-2 number, since 2×20653431145² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20653431145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35005521 + ... + 35006110.

It is an arithmetic number, because the mean of its divisors is an integer number (3150523440).

Almost surely, 2^20653431145 is an apocalyptic number.

It is an amenable number.

20653431145 is a deficient number, since it is larger than the sum of its proper divisors (4550756375).

20653431145 is an equidigital number, since it uses as much as digits as its factorization.

20653431145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70011695.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 20653431145 its reverse (54113435602), we get a palindrome (74766866747).

The spelling of 20653431145 in words is "twenty billion, six hundred fifty-three million, four hundred thirty-one thousand, one hundred forty-five".