20878359389 has 2 divisors, whose sum is σ = 20878359390. Its totient is φ = 20878359388.

The previous prime is 20878359347. The next prime is 20878359401. The reversal of 20878359389 is 98395387802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17015115364 + 3863244025 = 130442^2 + 62155^2 .

It is a cyclic number.

It is not a de Polignac number, because 20878359389 - 2¹² = 20878355293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20878359289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10439179694 + 10439179695.

It is an arithmetic number, because the mean of its divisors is an integer number (10439179695).

Almost surely, 2^20878359389 is an apocalyptic number.

It is an amenable number.

20878359389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20878359389 is an equidigital number, since it uses as much as digits as its factorization.

20878359389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26127360, while the sum is 62.

The spelling of 20878359389 in words is "twenty billion, eight hundred seventy-eight million, three hundred fifty-nine thousand, three hundred eighty-nine".