20313537443 has 4 divisors (see below), whose sum is σ = 20313828480. Its totient is φ = 20313246408.

The previous prime is 20313537437. The next prime is 20313537451. The reversal of 20313537443 is 34473531302.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20313537443 - 2¹² = 20313533347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20333537443) 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, 28721 + ... + 203597.

It is an arithmetic number, because the mean of its divisors is an integer number (5078457120).

Almost surely, 2^20313537443 is an apocalyptic number.

20313537443 is a deficient number, since it is larger than the sum of its proper divisors (291037).

20313537443 is a wasteful number, since it uses less digits than its factorization.

20313537443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291036.

The product of its (nonzero) digits is 90720, while the sum is 35.

The spelling of 20313537443 in words is "twenty billion, three hundred thirteen million, five hundred thirty-seven thousand, four hundred forty-three".