20430075 has 24 divisors (see below), whose sum is σ = 33964096. Its totient is φ = 10836000.

The previous prime is 20430071. The next prime is 20430077. The reversal of 20430075 is 57003402.

It is a happy number.

It is not a de Polignac number, because 20430075 - 2² = 20430071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20430071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15180 + ... + 16470.

Almost surely, 2^20430075 is an apocalyptic number.

20430075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20430075 is a deficient number, since it is larger than the sum of its proper divisors (13534021).

20430075 is a wasteful number, since it uses less digits than its factorization.

20430075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515 (or 1510 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 20430075 is about 4519.9640485296. The cubic root of 20430075 is about 273.3736514324.

Adding to 20430075 its reverse (57003402), we get a palindrome (77433477).

The spelling of 20430075 in words is "twenty million, four hundred thirty thousand, seventy-five".