20017835381 has 2 divisors, whose sum is σ = 20017835382. Its totient is φ = 20017835380.

The previous prime is 20017835317. The next prime is 20017835441. The reversal of 20017835381 is 18353871002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13425856900 + 6591978481 = 115870^2 + 81191^2 .

It is a cyclic number.

It is not a de Polignac number, because 20017835381 - 2⁶ = 20017835317 is a prime.

It is a super-2 number, since 2×20017835381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20017835581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10008917690 + 10008917691.

It is an arithmetic number, because the mean of its divisors is an integer number (10008917691).

Almost surely, 2^20017835381 is an apocalyptic number.

It is an amenable number.

20017835381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20017835381 is an equidigital number, since it uses as much as digits as its factorization.

20017835381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 20017835381 in words is "twenty billion, seventeen million, eight hundred thirty-five thousand, three hundred eighty-one".