20424311 has 4 divisors (see below), whose sum is σ = 20611800. Its totient is φ = 20236824.

The previous prime is 20424307. The next prime is 20424329. The reversal of 20424311 is 11342402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20424311 - 2² = 20424307 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20424311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424301) 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, 93581 + ... + 93798.

It is an arithmetic number, because the mean of its divisors is an integer number (5152950).

Almost surely, 2^20424311 is an apocalyptic number.

20424311 is a deficient number, since it is larger than the sum of its proper divisors (187489).

20424311 is a wasteful number, since it uses less digits than its factorization.

20424311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187488.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20424311 is about 4519.3263878591. The cubic root of 20424311 is about 273.3479397641.

Adding to 20424311 its reverse (11342402), we get a palindrome (31766713).

The spelling of 20424311 in words is "twenty million, four hundred twenty-four thousand, three hundred eleven".