20747647 has 2 divisors, whose sum is σ = 20747648. Its totient is φ = 20747646.

The previous prime is 20747641. The next prime is 20747653. The reversal of 20747647 is 74674702.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (20747641) and next prime (20747653).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20747647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20747641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10373823 + 10373824.

It is an arithmetic number, because the mean of its divisors is an integer number (10373824).

Almost surely, 2^20747647 is an apocalyptic number.

20747647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20747647 is an equidigital number, since it uses as much as digits as its factorization.

20747647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65856, while the sum is 37.

The square root of 20747647 is about 4554.9585069460. The cubic root of 20747647 is about 274.7828456486.

The spelling of 20747647 in words is "twenty million, seven hundred forty-seven thousand, six hundred forty-seven".