20653189 has 2 divisors, whose sum is σ = 20653190. Its totient is φ = 20653188.

The previous prime is 20653169. The next prime is 20653229. The reversal of 20653189 is 98135602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10349089 + 10304100 = 3217^2 + 3210^2 .

It is a cyclic number.

It is not a de Polignac number, because 20653189 - 2¹³ = 20644997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20653109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10326594 + 10326595.

It is an arithmetic number, because the mean of its divisors is an integer number (10326595).

Almost surely, 2^20653189 is an apocalyptic number.

It is an amenable number.

20653189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20653189 is an equidigital number, since it uses as much as digits as its factorization.

20653189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20653189 is about 4544.5779782066. The cubic root of 20653189 is about 274.3652090985.

The spelling of 20653189 in words is "twenty million, six hundred fifty-three thousand, one hundred eighty-nine".