20402420214131 has 4 divisors (see below), whose sum is σ = 20425526013672. Its totient is φ = 20379314414592.

The previous prime is 20402420214119. The next prime is 20402420214133. The reversal of 20402420214131 is 13141202420402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20402420214131 is a prime.

It is a super-2 number, since 2×20402420214131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20402420214131.

It is not an unprimeable number, because it can be changed into a prime (20402420214133) 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, 11552898446 + ... + 11552900211.

It is an arithmetic number, because the mean of its divisors is an integer number (5106381503418).

Almost surely, 2^{20402420214131} is an apocalyptic number.

20402420214131 is a deficient number, since it is larger than the sum of its proper divisors (23105799541).

20402420214131 is an equidigital number, since it uses as much as digits as its factorization.

20402420214131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23105799540.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 20402420214131 its reverse (13141202420402), we get a palindrome (33543622634533).

The spelling of 20402420214131 in words is "twenty trillion, four hundred two billion, four hundred twenty million, two hundred fourteen thousand, one hundred thirty-one".