20520106889 has 2 divisors, whose sum is σ = 20520106890. Its totient is φ = 20520106888.

The previous prime is 20520106843. The next prime is 20520106973. The reversal of 20520106889 is 98860102502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18704665225 + 1815441664 = 136765^2 + 42608^2 .

It is a cyclic number.

It is not a de Polignac number, because 20520106889 - 2²⁴ = 20503329673 is a prime.

It is not a weakly prime, because it can be changed into another prime (20520106289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10260053444 + 10260053445.

It is an arithmetic number, because the mean of its divisors is an integer number (10260053445).

Almost surely, 2^20520106889 is an apocalyptic number.

It is an amenable number.

20520106889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20520106889 is an equidigital number, since it uses as much as digits as its factorization.

20520106889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 41.

The spelling of 20520106889 in words is "twenty billion, five hundred twenty million, one hundred six thousand, eight hundred eighty-nine".