20434109 has 2 divisors, whose sum is σ = 20434110. Its totient is φ = 20434108.

The previous prime is 20434093. The next prime is 20434147. The reversal of 20434109 is 90143402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12888100 + 7546009 = 3590^2 + 2747^2 .

It is a cyclic number.

It is not a de Polignac number, because 20434109 - 2⁴ = 20434093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20434409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217054 + 10217055.

It is an arithmetic number, because the mean of its divisors is an integer number (10217055).

Almost surely, 2^20434109 is an apocalyptic number.

It is an amenable number.

20434109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20434109 is an equidigital number, since it uses as much as digits as its factorization.

20434109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20434109 is about 4520.4102689911. The cubic root of 20434109 is about 273.3916431552.

The spelling of 20434109 in words is "twenty million, four hundred thirty-four thousand, one hundred nine".