20402240389 has 2 divisors, whose sum is σ = 20402240390. Its totient is φ = 20402240388.

The previous prime is 20402240371. The next prime is 20402240407. The reversal of 20402240389 is 98304220402.

It is a balanced prime because it is at equal distance from previous prime (20402240371) and next prime (20402240407).

It can be written as a sum of positive squares in only one way, i.e., 14127224164 + 6275016225 = 118858^2 + 79215^2 .

It is a cyclic number.

It is not a de Polignac number, because 20402240389 - 2⁵ = 20402240357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20402340389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201120194 + 10201120195.

It is an arithmetic number, because the mean of its divisors is an integer number (10201120195).

Almost surely, 2^20402240389 is an apocalyptic number.

It is an amenable number.

20402240389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402240389 is an equidigital number, since it uses as much as digits as its factorization.

20402240389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 34.

The spelling of 20402240389 in words is "twenty billion, four hundred two million, two hundred forty thousand, three hundred eighty-nine".