20719247 has 2 divisors, whose sum is σ = 20719248. Its totient is φ = 20719246.

The previous prime is 20719217. The next prime is 20719267. The reversal of 20719247 is 74291702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20719247 - 2¹⁴ = 20702863 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20719217) 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, 10359623 + 10359624.

It is an arithmetic number, because the mean of its divisors is an integer number (10359624).

Almost surely, 2^20719247 is an apocalyptic number.

20719247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20719247 is an equidigital number, since it uses as much as digits as its factorization.

20719247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 20719247 is about 4551.8399576435. The cubic root of 20719247 is about 274.6574114049.

The spelling of 20719247 in words is "twenty million, seven hundred nineteen thousand, two hundred forty-seven".