20138415065 has 8 divisors (see below), whose sum is σ = 24193658760. Its totient is φ = 16092358272.

The previous prime is 20138415061. The next prime is 20138415163. The reversal of 20138415065 is 56051483102.

It can be written as a sum of positive squares in 4 ways, for example, as 2108370889 + 18030044176 = 45917^2 + 134276^2 .

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 20138415065 - 2² = 20138415061 is a prime.

It is a super-2 number, since 2×20138415065² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20138415061) by changing a digit.

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, 2291900 + ... + 2300669.

It is an arithmetic number, because the mean of its divisors is an integer number (3024207345).

Almost surely, 2^20138415065 is an apocalyptic number.

It is an amenable number.

20138415065 is a deficient number, since it is larger than the sum of its proper divisors (4055243695).

20138415065 is an equidigital number, since it uses as much as digits as its factorization.

20138415065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4593451.

The product of its (nonzero) digits is 28800, while the sum is 35.

Adding to 20138415065 its reverse (56051483102), we get a palindrome (76189898167).

The spelling of 20138415065 in words is "twenty billion, one hundred thirty-eight million, four hundred fifteen thousand, sixty-five".