20430434 has 12 divisors (see below), whose sum is σ = 32344614. Its totient is φ = 9677232.

The previous prime is 20430409. The next prime is 20430439. The reversal of 20430434 is 43403402.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19936225 + 494209 = 4465^2 + 703^2 .

It is not an unprimeable number, because it can be changed into a prime (20430439) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13427 + ... + 14870.

Almost surely, 2^20430434 is an apocalyptic number.

20430434 is a deficient number, since it is larger than the sum of its proper divisors (11914180).

20430434 is a wasteful number, since it uses less digits than its factorization.

20430434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28337 (or 28318 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 20430434 is about 4520.0037610604. The cubic root of 20430434 is about 273.3752526758.

Adding to 20430434 its reverse (43403402), we get a palindrome (63833836).

The spelling of 20430434 in words is "twenty million, four hundred thirty thousand, four hundred thirty-four".