20738538065 has 8 divisors (see below), whose sum is σ = 28441423680. Its totient is φ = 14220711792.

The previous prime is 20738538061. The next prime is 20738538071. The reversal of 20738538065 is 56083583702.

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

It is not a de Polignac number, because 20738538065 - 2² = 20738538061 is a prime.

It is a super-2 number, since 2×20738538065² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20738538061) by changing a digit.

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, 296264795 + ... + 296264864.

It is an arithmetic number, because the mean of its divisors is an integer number (3555177960).

Almost surely, 2^20738538065 is an apocalyptic number.

It is an amenable number.

20738538065 is a deficient number, since it is larger than the sum of its proper divisors (7702885615).

20738538065 is an equidigital number, since it uses as much as digits as its factorization.

20738538065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592529671.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 20738538065 in words is "twenty billion, seven hundred thirty-eight million, five hundred thirty-eight thousand, sixty-five".