20408029 has 2 divisors, whose sum is σ = 20408030. Its totient is φ = 20408028.

The previous prime is 20407997. The next prime is 20408039. The reversal of 20408029 is 92080402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19404025 + 1004004 = 4405^2 + 1002^2 .

It is a cyclic number.

It is not a de Polignac number, because 20408029 - 2⁵ = 20407997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20407994 and 20408012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20408039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10204014 + 10204015.

It is an arithmetic number, because the mean of its divisors is an integer number (10204015).

Almost surely, 2^20408029 is an apocalyptic number.

It is an amenable number.

20408029 is a deficient number, since it is larger than the sum of its proper divisors (1).

20408029 is an equidigital number, since it uses as much as digits as its factorization.

20408029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20408029 is about 4517.5246540556. The cubic root of 20408029 is about 273.2752839579.

The spelling of 20408029 in words is "twenty million, four hundred eight thousand, twenty-nine".