20297587 has 2 divisors, whose sum is σ = 20297588. Its totient is φ = 20297586.

The previous prime is 20297539. The next prime is 20297597. The reversal of 20297587 is 78579202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20297587 - 2¹⁵ = 20264819 is a prime.

It is not a weakly prime, because it can be changed into another prime (20297527) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10148793 + 10148794.

It is an arithmetic number, because the mean of its divisors is an integer number (10148794).

Almost surely, 2^20297587 is an apocalyptic number.

20297587 is a deficient number, since it is larger than the sum of its proper divisors (1).

20297587 is an equidigital number, since it uses as much as digits as its factorization.

20297587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 20297587 is about 4505.2843417480. The cubic root of 20297587 is about 272.7814313218.

The spelling of 20297587 in words is "twenty million, two hundred ninety-seven thousand, five hundred eighty-seven".