20456654443 has 2 divisors, whose sum is σ = 20456654444. Its totient is φ = 20456654442.

The previous prime is 20456654423. The next prime is 20456654507. The reversal of 20456654443 is 34445665402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20456654443 is a prime.

It is a super-2 number, since 2×20456654443² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20456654443.

It is not a weakly prime, because it can be changed into another prime (20456654423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10228327221 + 10228327222.

It is an arithmetic number, because the mean of its divisors is an integer number (10228327222).

Almost surely, 2^20456654443 is an apocalyptic number.

20456654443 is a deficient number, since it is larger than the sum of its proper divisors (1).

20456654443 is an equidigital number, since it uses as much as digits as its factorization.

20456654443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1382400, while the sum is 43.

The spelling of 20456654443 in words is "twenty billion, four hundred fifty-six million, six hundred fifty-four thousand, four hundred forty-three".