20020756243 has 4 divisors (see below), whose sum is σ = 20021387328. Its totient is φ = 20020125160.

The previous prime is 20020756211. The next prime is 20020756271. The reversal of 20020756243 is 34265702002.

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 20020756243 - 2⁵ = 20020756211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20020706243) 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, 265288 + ... + 332293.

It is an arithmetic number, because the mean of its divisors is an integer number (5005346832).

Almost surely, 2^20020756243 is an apocalyptic number.

20020756243 is a deficient number, since it is larger than the sum of its proper divisors (631085).

20020756243 is an equidigital number, since it uses as much as digits as its factorization.

20020756243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631084.

The product of its (nonzero) digits is 20160, while the sum is 31.

The spelling of 20020756243 in words is "twenty billion, twenty million, seven hundred fifty-six thousand, two hundred forty-three".