20117625311765 has 16 divisors (see below), whose sum is σ = 24366165764976. Its totient is φ = 15944223052800.

The previous prime is 20117625311737. The next prime is 20117625311837. The reversal of 20117625311765 is 56711352671102.

It can be written as a sum of positive squares in 8 ways, for example, as 3944045065444 + 16173580246321 = 1985962^2 + 4021639^2 .

It is not a de Polignac number, because 20117625311765 - 2⁶ = 20117625311701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7105706 + ... + 9525035.

It is an arithmetic number, because the mean of its divisors is an integer number (1522885360311).

Almost surely, 2^{20117625311765} is an apocalyptic number.

It is an amenable number.

20117625311765 is a deficient number, since it is larger than the sum of its proper divisors (4248540453211).

20117625311765 is a wasteful number, since it uses less digits than its factorization.

20117625311765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16633000.

The product of its (nonzero) digits is 529200, while the sum is 47.

Adding to 20117625311765 its reverse (56711352671102), we get a palindrome (76828977982867).

The spelling of 20117625311765 in words is "twenty trillion, one hundred seventeen billion, six hundred twenty-five million, three hundred eleven thousand, seven hundred sixty-five".