20059861 has 2 divisors, whose sum is σ = 20059862. Its totient is φ = 20059860.

The previous prime is 20059849. The next prime is 20059901. The reversal of 20059861 is 16895002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19980900 + 78961 = 4470^2 + 281^2 .

It is a cyclic number.

It is not a de Polignac number, because 20059861 - 2⁹ = 20059349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20059261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10029930 + 10029931.

It is an arithmetic number, because the mean of its divisors is an integer number (10029931).

Almost surely, 2^20059861 is an apocalyptic number.

It is an amenable number.

20059861 is a deficient number, since it is larger than the sum of its proper divisors (1).

20059861 is an equidigital number, since it uses as much as digits as its factorization.

20059861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 20059861 is about 4478.8236178711. The cubic root of 20059861 is about 271.7123048439.

The spelling of 20059861 in words is "twenty million, fifty-nine thousand, eight hundred sixty-one".