20402311320401 has 4 divisors (see below), whose sum is σ = 20402922036900. Its totient is φ = 20401700603904.

The previous prime is 20402311320397. The next prime is 20402311320403. The reversal of 20402311320401 is 10402311320402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9043732998400 + 11358578322001 = 3007280^2 + 3370249^2 .

It is a cyclic number.

It is not a de Polignac number, because 20402311320401 - 2² = 20402311320397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20402311320403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305308136 + ... + 305374953.

It is an arithmetic number, because the mean of its divisors is an integer number (5100730509225).

Almost surely, 2^{20402311320401} is an apocalyptic number.

It is an amenable number.

20402311320401 is a deficient number, since it is larger than the sum of its proper divisors (610716499).

20402311320401 is an equidigital number, since it uses as much as digits as its factorization.

20402311320401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610716498.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 20402311320401 its reverse (10402311320402), we get a palindrome (30804622640803).

Subtracting from 20402311320401 its reverse (10402311320402), we obtain a palindrome (9999999999999).

The spelling of 20402311320401 in words is "twenty trillion, four hundred two billion, three hundred eleven million, three hundred twenty thousand, four hundred one".