20430311 has 8 divisors (see below), whose sum is σ = 23598864. Its totient is φ = 17480320.

The previous prime is 20430307. The next prime is 20430323. The reversal of 20430311 is 11303402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20430311 - 2² = 20430307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54440 + ... + 54813.

It is an arithmetic number, because the mean of its divisors is an integer number (2949858).

Almost surely, 2^20430311 is an apocalyptic number.

20430311 is a deficient number, since it is larger than the sum of its proper divisors (3168553).

20430311 is a wasteful number, since it uses less digits than its factorization.

20430311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109281.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20430311 is about 4519.9901548565. The cubic root of 20430311 is about 273.3747040625.

Adding to 20430311 its reverse (11303402), we get a palindrome (31733713).

The spelling of 20430311 in words is "twenty million, four hundred thirty thousand, three hundred eleven".