20311343 has 4 divisors (see below), whose sum is σ = 21873768. Its totient is φ = 18748920.

The previous prime is 20311337. The next prime is 20311363. The reversal of 20311343 is 34311302.

It is a happy number.

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 20311343 - 2⁸ = 20311087 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 (20311363) 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, 781193 + ... + 781218.

It is an arithmetic number, because the mean of its divisors is an integer number (5468442).

Almost surely, 2^20311343 is an apocalyptic number.

20311343 is a deficient number, since it is larger than the sum of its proper divisors (1562425).

20311343 is a wasteful number, since it uses less digits than its factorization.

20311343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1562424.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 20311343 is about 4506.8107348767. The cubic root of 20311343 is about 272.8430401887.

Adding to 20311343 its reverse (34311302), we get a palindrome (54622645).

The spelling of 20311343 in words is "twenty million, three hundred eleven thousand, three hundred forty-three".