20402440067 has 2 divisors, whose sum is σ = 20402440068. Its totient is φ = 20402440066.

The previous prime is 20402439997. The next prime is 20402440127. The reversal of 20402440067 is 76004420402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20402440067 - 2¹⁴ = 20402423683 is a prime.

It is not a weakly prime, because it can be changed into another prime (20402440567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201220033 + 10201220034.

It is an arithmetic number, because the mean of its divisors is an integer number (10201220034).

Almost surely, 2^20402440067 is an apocalyptic number.

20402440067 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402440067 is an equidigital number, since it uses as much as digits as its factorization.

20402440067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 29.

Adding to 20402440067 its reverse (76004420402), we get a palindrome (96406860469).

The spelling of 20402440067 in words is "twenty billion, four hundred two million, four hundred forty thousand, sixty-seven".