20408077 has 2 divisors, whose sum is σ = 20408078. Its totient is φ = 20408076.

The previous prime is 20408051. The next prime is 20408081. The reversal of 20408077 is 77080402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12823561 + 7584516 = 3581^2 + 2754^2 .

It is a cyclic number.

It is not a de Polignac number, because 20408077 - 2¹⁹ = 19883789 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20408677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10204038 + 10204039.

It is an arithmetic number, because the mean of its divisors is an integer number (10204039).

Almost surely, 2^20408077 is an apocalyptic number.

It is an amenable number.

20408077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20408077 is an equidigital number, since it uses as much as digits as its factorization.

20408077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 20408077 is about 4517.5299666964. The cubic root of 20408077 is about 273.2754982069.

Adding to 20408077 its reverse (77080402), we get a palindrome (97488479).

The spelling of 20408077 in words is "twenty million, four hundred eight thousand, seventy-seven".