20045213381 has 2 divisors, whose sum is σ = 20045213382. Its totient is φ = 20045213380.

The previous prime is 20045213333. The next prime is 20045213393. The reversal of 20045213381 is 18331254002.

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., 19330453156 + 714760225 = 139034^2 + 26735^2 .

It is a cyclic number.

It is not a de Polignac number, because 20045213381 - 2²² = 20041019077 is a prime.

It is a super-2 number, since 2×20045213381² (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 (20045213311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10022606690 + 10022606691.

It is an arithmetic number, because the mean of its divisors is an integer number (10022606691).

Almost surely, 2^20045213381 is an apocalyptic number.

It is an amenable number.

20045213381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20045213381 is an equidigital number, since it uses as much as digits as its factorization.

20045213381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 20045213381 its reverse (18331254002), we get a palindrome (38376467383).

The spelling of 20045213381 in words is "twenty billion, forty-five million, two hundred thirteen thousand, three hundred eighty-one".