20366251 has 2 divisors, whose sum is σ = 20366252. Its totient is φ = 20366250.

The previous prime is 20366249. The next prime is 20366263. The reversal of 20366251 is 15266302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20366251 - 2¹ = 20366249 is a prime.

Together with 20366249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20366351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10183125 + 10183126.

It is an arithmetic number, because the mean of its divisors is an integer number (10183126).

Almost surely, 2^20366251 is an apocalyptic number.

20366251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20366251 is an equidigital number, since it uses as much as digits as its factorization.

20366251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20366251 is about 4512.8982926718. The cubic root of 20366251 is about 273.0886793895.

The spelling of 20366251 in words is "twenty million, three hundred sixty-six thousand, two hundred fifty-one".