20207149 has 2 divisors, whose sum is σ = 20207150. Its totient is φ = 20207148.

The previous prime is 20207147. The next prime is 20207153. The reversal of 20207149 is 94170202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15721225 + 4485924 = 3965^2 + 2118^2 .

It is a cyclic number.

It is not a de Polignac number, because 20207149 - 2¹ = 20207147 is a prime.

Together with 20207147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20207147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10103574 + 10103575.

It is an arithmetic number, because the mean of its divisors is an integer number (10103575).

Almost surely, 2^20207149 is an apocalyptic number.

It is an amenable number.

20207149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20207149 is an equidigital number, since it uses as much as digits as its factorization.

20207149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20207149 is about 4495.2362563051. The cubic root of 20207149 is about 272.3756928191.

The spelling of 20207149 in words is "twenty million, two hundred seven thousand, one hundred forty-nine".