20451029 has 2 divisors, whose sum is σ = 20451030. Its totient is φ = 20451028.

The previous prime is 20451007. The next prime is 20451037. The reversal of 20451029 is 92015402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16443025 + 4008004 = 4055^2 + 2002^2 .

It is a cyclic number.

It is not a de Polignac number, because 20451029 - 2¹⁶ = 20385493 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20450995 and 20451013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20451059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10225514 + 10225515.

It is an arithmetic number, because the mean of its divisors is an integer number (10225515).

Almost surely, 2^20451029 is an apocalyptic number.

It is an amenable number.

20451029 is a deficient number, since it is larger than the sum of its proper divisors (1).

20451029 is an equidigital number, since it uses as much as digits as its factorization.

20451029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 20451029 is about 4522.2813932793. The cubic root of 20451029 is about 273.4670809184.

The spelling of 20451029 in words is "twenty million, four hundred fifty-one thousand, twenty-nine".