20451329 has 2 divisors, whose sum is σ = 20451330. Its totient is φ = 20451328.

The previous prime is 20451317. The next prime is 20451373. The reversal of 20451329 is 92315402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14938225 + 5513104 = 3865^2 + 2348^2 .

It is a cyclic number.

It is not a de Polignac number, because 20451329 - 2⁸ = 20451073 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20451298 and 20451307.

It is not a weakly prime, because it can be changed into another prime (20451029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10225664 + 10225665.

It is an arithmetic number, because the mean of its divisors is an integer number (10225665).

Almost surely, 2^20451329 is an apocalyptic number.

It is an amenable number.

20451329 is a deficient number, since it is larger than the sum of its proper divisors (1).

20451329 is an equidigital number, since it uses as much as digits as its factorization.

20451329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20451329 is about 4522.3145622568. The cubic root of 20451329 is about 273.4684180919.

The spelling of 20451329 in words is "twenty million, four hundred fifty-one thousand, three hundred twenty-nine".