20149061 has 2 divisors, whose sum is σ = 20149062. Its totient is φ = 20149060.

The previous prime is 20149049. The next prime is 20149067. The reversal of 20149061 is 16094102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19088161 + 1060900 = 4369^2 + 1030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20149061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20149067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10074530 + 10074531.

It is an arithmetic number, because the mean of its divisors is an integer number (10074531).

Almost surely, 2^20149061 is an apocalyptic number.

It is an amenable number.

20149061 is a deficient number, since it is larger than the sum of its proper divisors (1).

20149061 is an equidigital number, since it uses as much as digits as its factorization.

20149061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 20149061 is about 4488.7705443696. The cubic root of 20149061 is about 272.1144495655.

The spelling of 20149061 in words is "twenty million, one hundred forty-nine thousand, sixty-one".