20402440127 has 2 divisors, whose sum is σ = 20402440128. Its totient is φ = 20402440126.

The previous prime is 20402440067. The next prime is 20402440133. The reversal of 20402440127 is 72104420402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20402440127 - 2²⁰ = 20401391551 is a prime.

It is a super-2 number, since 2×20402440127² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20402440096 and 20402440105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20402440187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201220063 + 10201220064.

It is an arithmetic number, because the mean of its divisors is an integer number (10201220064).

Almost surely, 2^20402440127 is an apocalyptic number.

20402440127 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402440127 is an equidigital number, since it uses as much as digits as its factorization.

20402440127 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 26.

Adding to 20402440127 its reverse (72104420402), we get a palindrome (92506860529).

The spelling of 20402440127 in words is "twenty billion, four hundred two million, four hundred forty thousand, one hundred twenty-seven".