20894826779 has 2 divisors, whose sum is σ = 20894826780. Its totient is φ = 20894826778.

The previous prime is 20894826749. The next prime is 20894826817. The reversal of 20894826779 is 97762849802.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20894826779 is a prime.

It is a super-2 number, since 2×20894826779² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20894826749) 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, 10447413389 + 10447413390.

It is an arithmetic number, because the mean of its divisors is an integer number (10447413390).

Almost surely, 2^20894826779 is an apocalyptic number.

20894826779 is a deficient number, since it is larger than the sum of its proper divisors (1).

20894826779 is an equidigital number, since it uses as much as digits as its factorization.

20894826779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24385536, while the sum is 62.

The spelling of 20894826779 in words is "twenty billion, eight hundred ninety-four million, eight hundred twenty-six thousand, seven hundred seventy-nine".