20727643 has 2 divisors, whose sum is σ = 20727644. Its totient is φ = 20727642.

The previous prime is 20727601. The next prime is 20727647. The reversal of 20727643 is 34672702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20727643 is a prime.

It is not a weakly prime, because it can be changed into another prime (20727647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10363821 + 10363822.

It is an arithmetic number, because the mean of its divisors is an integer number (10363822).

Almost surely, 2^20727643 is an apocalyptic number.

20727643 is a deficient number, since it is larger than the sum of its proper divisors (1).

20727643 is an equidigital number, since it uses as much as digits as its factorization.

20727643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 31.

The square root of 20727643 is about 4552.7621286423. The cubic root of 20727643 is about 274.6945059352.

The spelling of 20727643 in words is "twenty million, seven hundred twenty-seven thousand, six hundred forty-three".