20639483 has 2 divisors, whose sum is σ = 20639484. Its totient is φ = 20639482.

The previous prime is 20639471. The next prime is 20639497. The reversal of 20639483 is 38493602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20639483 - 2²² = 16445179 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20639383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10319741 + 10319742.

It is an arithmetic number, because the mean of its divisors is an integer number (10319742).

Almost surely, 2^20639483 is an apocalyptic number.

20639483 is a deficient number, since it is larger than the sum of its proper divisors (1).

20639483 is an equidigital number, since it uses as much as digits as its factorization.

20639483 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 20639483 is about 4543.0697771441. The cubic root of 20639483 is about 274.3045036757.

The spelling of 20639483 in words is "twenty million, six hundred thirty-nine thousand, four hundred eighty-three".