20020400042381 has 2 divisors, whose sum is σ = 20020400042382. Its totient is φ = 20020400042380.

The previous prime is 20020400042341. The next prime is 20020400042491. The reversal of 20020400042381 is 18324000402002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18236879857156 + 1783520185225 = 4270466^2 + 1335485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20020400042381 is a prime.

It is a super-2 number, since 2×20020400042381² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20020400042381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20020400042311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010200021190 + 10010200021191.

It is an arithmetic number, because the mean of its divisors is an integer number (10010200021191).

Almost surely, 2^{20020400042381} is an apocalyptic number.

It is an amenable number.

20020400042381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020400042381 is an equidigital number, since it uses as much as digits as its factorization.

20020400042381 is an evil number, because the sum of its binary digits is even.

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

Adding to 20020400042381 its reverse (18324000402002), we get a palindrome (38344400444383).

The spelling of 20020400042381 in words is "twenty trillion, twenty billion, four hundred million, forty-two thousand, three hundred eighty-one".