20006426477 has 2 divisors, whose sum is σ = 20006426478. Its totient is φ = 20006426476.

The previous prime is 20006426441. The next prime is 20006426509. The reversal of 20006426477 is 77462460002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10795417801 + 9211008676 = 103901^2 + 95974^2 .

It is a cyclic number.

It is not a de Polignac number, because 20006426477 - 2¹⁸ = 20006164333 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20006426477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20006426677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10003213238 + 10003213239.

It is an arithmetic number, because the mean of its divisors is an integer number (10003213239).

Almost surely, 2^20006426477 is an apocalyptic number.

It is an amenable number.

20006426477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20006426477 is an equidigital number, since it uses as much as digits as its factorization.

20006426477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 38.

Adding to 20006426477 its reverse (77462460002), we get a palindrome (97468886479).

The spelling of 20006426477 in words is "twenty billion, six million, four hundred twenty-six thousand, four hundred seventy-seven".