20446777123 has 2 divisors, whose sum is σ = 20446777124. Its totient is φ = 20446777122.

The previous prime is 20446777111. The next prime is 20446777157. The reversal of 20446777123 is 32177764402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20446777123 - 2⁹ = 20446776611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20446777123.

It is not a weakly prime, because it can be changed into another prime (20446777223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10223388561 + 10223388562.

It is an arithmetic number, because the mean of its divisors is an integer number (10223388562).

Almost surely, 2^20446777123 is an apocalyptic number.

20446777123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20446777123 is an equidigital number, since it uses as much as digits as its factorization.

20446777123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 395136, while the sum is 43.

The spelling of 20446777123 in words is "twenty billion, four hundred forty-six million, seven hundred seventy-seven thousand, one hundred twenty-three".