20402240407 has 2 divisors, whose sum is σ = 20402240408. Its totient is φ = 20402240406.

The previous prime is 20402240389. The next prime is 20402240423. The reversal of 20402240407 is 70404220402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20402240407 - 2¹¹ = 20402238359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20402240207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201120203 + 10201120204.

It is an arithmetic number, because the mean of its divisors is an integer number (10201120204).

Almost surely, 2^20402240407 is an apocalyptic number.

20402240407 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402240407 is an equidigital number, since it uses as much as digits as its factorization.

20402240407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 25.

Adding to 20402240407 its reverse (70404220402), we get a palindrome (90806460809).

The spelling of 20402240407 in words is "twenty billion, four hundred two million, two hundred forty thousand, four hundred seven".