20111220413 has 8 divisors (see below), whose sum is σ = 20174776248. Its totient is φ = 20047716864.

The previous prime is 20111220407. The next prime is 20111220419. The reversal of 20111220413 is 31402211102.

It is an interprime number because it is at equal distance from previous prime (20111220407) and next prime (20111220419).

It can be written as a sum of positive squares in 4 ways, for example, as 9144523129 + 10966697284 = 95627^2 + 104722^2 .

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 20111220413 - 2⁴ = 20111220397 is a prime.

It is a super-2 number, since 2×20111220413² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111220391 and 20111220400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111220419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 845045 + ... + 868517.

It is an arithmetic number, because the mean of its divisors is an integer number (2521847031).

Almost surely, 2^20111220413 is an apocalyptic number.

It is an amenable number.

20111220413 is a deficient number, since it is larger than the sum of its proper divisors (63555835).

20111220413 is a wasteful number, since it uses less digits than its factorization.

20111220413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26143.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20111220413 its reverse (31402211102), we get a palindrome (51513431515).

The spelling of 20111220413 in words is "twenty billion, one hundred eleven million, two hundred twenty thousand, four hundred thirteen".