20400244223 has 2 divisors, whose sum is σ = 20400244224. Its totient is φ = 20400244222.

The previous prime is 20400244211. The next prime is 20400244229. The reversal of 20400244223 is 32244200402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20400244223 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20400244229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200122111 + 10200122112.

It is an arithmetic number, because the mean of its divisors is an integer number (10200122112).

Almost surely, 2^20400244223 is an apocalyptic number.

20400244223 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400244223 is an equidigital number, since it uses as much as digits as its factorization.

20400244223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 23.

Adding to 20400244223 its reverse (32244200402), we get a palindrome (52644444625).

The spelling of 20400244223 in words is "twenty billion, four hundred million, two hundred forty-four thousand, two hundred twenty-three".