20495647 has 2 divisors, whose sum is σ = 20495648. Its totient is φ = 20495646.

The previous prime is 20495639. The next prime is 20495653. The reversal of 20495647 is 74659402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20495647 - 2³ = 20495639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20495687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10247823 + 10247824.

It is an arithmetic number, because the mean of its divisors is an integer number (10247824).

Almost surely, 2^20495647 is an apocalyptic number.

20495647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20495647 is an equidigital number, since it uses as much as digits as its factorization.

20495647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 20495647 is about 4527.2118351144. The cubic root of 20495647 is about 273.6658107978.

The spelling of 20495647 in words is "twenty million, four hundred ninety-five thousand, six hundred forty-seven".