20738647 has 2 divisors, whose sum is σ = 20738648. Its totient is φ = 20738646.

The previous prime is 20738639. The next prime is 20738651. The reversal of 20738647 is 74683702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20738647 - 2³ = 20738639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20738687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10369323 + 10369324.

It is an arithmetic number, because the mean of its divisors is an integer number (10369324).

Almost surely, 2^20738647 is an apocalyptic number.

20738647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20738647 is an equidigital number, since it uses as much as digits as its factorization.

20738647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 20738647 is about 4553.9704654290. The cubic root of 20738647 is about 274.7431077563.

The spelling of 20738647 in words is "twenty million, seven hundred thirty-eight thousand, six hundred forty-seven".