20471029 has 2 divisors, whose sum is σ = 20471030. Its totient is φ = 20471028.

The previous prime is 20471021. The next prime is 20471041. The reversal of 20471029 is 92017402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10692900 + 9778129 = 3270^2 + 3127^2 .

It is a cyclic number.

It is not a de Polignac number, because 20471029 - 2³ = 20471021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20470994 and 20471012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20471021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10235514 + 10235515.

It is an arithmetic number, because the mean of its divisors is an integer number (10235515).

Almost surely, 2^20471029 is an apocalyptic number.

It is an amenable number.

20471029 is a deficient number, since it is larger than the sum of its proper divisors (1).

20471029 is an equidigital number, since it uses as much as digits as its factorization.

20471029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20471029 is about 4524.4921261949. The cubic root of 20471029 is about 273.5561972114.

The spelling of 20471029 in words is "twenty million, four hundred seventy-one thousand, twenty-nine".