20746478819389 has 2 divisors, whose sum is σ = 20746478819390. Its totient is φ = 20746478819388.

The previous prime is 20746478819369. The next prime is 20746478819419. The reversal of 20746478819389 is 98391887464702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20713375928025 + 33102891364 = 4551195^2 + 181942^2 .

It is a cyclic number.

It is not a de Polignac number, because 20746478819389 - 2²⁵ = 20746445264957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20746478819329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10373239409694 + 10373239409695.

It is an arithmetic number, because the mean of its divisors is an integer number (10373239409695).

Almost surely, 2^{20746478819389} is an apocalyptic number.

It is an amenable number.

20746478819389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20746478819389 is an equidigital number, since it uses as much as digits as its factorization.

20746478819389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1170505728, while the sum is 76.

The spelling of 20746478819389 in words is "twenty trillion, seven hundred forty-six billion, four hundred seventy-eight million, eight hundred nineteen thousand, three hundred eighty-nine".