20435969 has 2 divisors, whose sum is σ = 20435970. Its totient is φ = 20435968.

The previous prime is 20435959. The next prime is 20435977. The reversal of 20435969 is 96953402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19465744 + 970225 = 4412^2 + 985^2 .

It is a cyclic number.

It is not a de Polignac number, because 20435969 - 2⁴ = 20435953 is a prime.

It is a super-2 number, since 2×20435969² = 835257657937922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20435939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217984 + 10217985.

It is an arithmetic number, because the mean of its divisors is an integer number (10217985).

Almost surely, 2^20435969 is an apocalyptic number.

It is an amenable number.

20435969 is a deficient number, since it is larger than the sum of its proper divisors (1).

20435969 is an equidigital number, since it uses as much as digits as its factorization.

20435969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 20435969 is about 4520.6159978481. The cubic root of 20435969 is about 273.3999379957.

The spelling of 20435969 in words is "twenty million, four hundred thirty-five thousand, nine hundred sixty-nine".