20400310343 has 32 divisors (see below), whose sum is σ = 24187115520. Its totient is φ = 16842038400.

The previous prime is 20400310309. The next prime is 20400310351. The reversal of 20400310343 is 34301300402.

It is a cyclic number.

It is not a de Polignac number, because 20400310343 - 2¹⁴ = 20400293959 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 (20400310363) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14039405 + ... + 14040857.

It is an arithmetic number, because the mean of its divisors is an integer number (755847360).

Almost surely, 2^20400310343 is an apocalyptic number.

20400310343 is a deficient number, since it is larger than the sum of its proper divisors (3786805177).

20400310343 is a wasteful number, since it uses less digits than its factorization.

20400310343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 20400310343 its reverse (34301300402), we get a palindrome (54701610745).

The spelling of 20400310343 in words is "twenty billion, four hundred million, three hundred ten thousand, three hundred forty-three".