20485229 has 2 divisors, whose sum is σ = 20485230. Its totient is φ = 20485228.

The previous prime is 20485217. The next prime is 20485237. The reversal of 20485229 is 92258402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20475625 + 9604 = 4525^2 + 98^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20485229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20485195 and 20485204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20485529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10242614 + 10242615.

It is an arithmetic number, because the mean of its divisors is an integer number (10242615).

Almost surely, 2^20485229 is an apocalyptic number.

It is an amenable number.

20485229 is a deficient number, since it is larger than the sum of its proper divisors (1).

20485229 is an equidigital number, since it uses as much as digits as its factorization.

20485229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20485229 is about 4526.0610910592. The cubic root of 20485229 is about 273.6194345499.

The spelling of 20485229 in words is "twenty million, four hundred eighty-five thousand, two hundred twenty-nine".