20149589 has 2 divisors, whose sum is σ = 20149590. Its totient is φ = 20149588.

The previous prime is 20149559. The next prime is 20149603. The reversal of 20149589 is 98594102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14122564 + 6027025 = 3758^2 + 2455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20149589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20149529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10074794 + 10074795.

It is an arithmetic number, because the mean of its divisors is an integer number (10074795).

Almost surely, 2^20149589 is an apocalyptic number.

It is an amenable number.

20149589 is a deficient number, since it is larger than the sum of its proper divisors (1).

20149589 is an equidigital number, since it uses as much as digits as its factorization.

20149589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 20149589 is about 4488.8293574160. The cubic root of 20149589 is about 272.1168264368.

The spelling of 20149589 in words is "twenty million, one hundred forty-nine thousand, five hundred eighty-nine".