20430497 has 4 divisors (see below), whose sum is σ = 20527536. Its totient is φ = 20333460.

The previous prime is 20430469. The next prime is 20430499. The reversal of 20430497 is 79403402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20430497 - 2²² = 16236193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20430499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48203 + ... + 48624.

It is an arithmetic number, because the mean of its divisors is an integer number (5131884).

Almost surely, 2^20430497 is an apocalyptic number.

It is an amenable number.

20430497 is a deficient number, since it is larger than the sum of its proper divisors (97039).

20430497 is an equidigital number, since it uses as much as digits as its factorization.

20430497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97038.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20430497 is about 4520.0107300758. The cubic root of 20430497 is about 273.3755336720.

Adding to 20430497 its reverse (79403402), we get a palindrome (99833899).

The spelling of 20430497 in words is "twenty million, four hundred thirty thousand, four hundred ninety-seven".