20720511100065 has 32 divisors (see below), whose sum is σ = 38139854708736. Its totient is φ = 9409503614400.

The previous prime is 20720511100061. The next prime is 20720511100109. The reversal of 20720511100065 is 56000111502702.

It is not a de Polignac number, because 20720511100065 - 2² = 20720511100061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20720511100061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 653421897 + ... + 653453606.

It is an arithmetic number, because the mean of its divisors is an integer number (1191870459648).

Almost surely, 2^{20720511100065} is an apocalyptic number.

It is an amenable number.

20720511100065 is a deficient number, since it is larger than the sum of its proper divisors (17419343608671).

20720511100065 is a wasteful number, since it uses less digits than its factorization.

20720511100065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306875669.

The product of its (nonzero) digits is 4200, while the sum is 30.

Adding to 20720511100065 its reverse (56000111502702), we get a palindrome (76720622602767).

The spelling of 20720511100065 in words is "twenty trillion, seven hundred twenty billion, five hundred eleven million, one hundred thousand, sixty-five".