20434311 has 24 divisors (see below), whose sum is σ = 30270240. Its totient is φ = 13280256.

The previous prime is 20434259. The next prime is 20434319. The reversal of 20434311 is 11343402.

It is not a de Polignac number, because 20434311 - 2⁶ = 20434247 is a prime.

It is a super-2 number, since 2×20434311² = 835122132089442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434319) 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, 77566 + ... + 77828.

It is an arithmetic number, because the mean of its divisors is an integer number (1261260).

Almost surely, 2^20434311 is an apocalyptic number.

20434311 is a deficient number, since it is larger than the sum of its proper divisors (9835929).

20434311 is a wasteful number, since it uses less digits than its factorization.

20434311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455 (or 452 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20434311 is about 4520.4326120406. The cubic root of 20434311 is about 273.3925440171.

Adding to 20434311 its reverse (11343402), we get a palindrome (31777713).

Subtracting from 20434311 its reverse (11343402), we obtain a palindrome (9090909).

The spelling of 20434311 in words is "twenty million, four hundred thirty-four thousand, three hundred eleven".