20616983 has 2 divisors, whose sum is σ = 20616984. Its totient is φ = 20616982.

The previous prime is 20616979. The next prime is 20616989. The reversal of 20616983 is 38961602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20616983 - 2² = 20616979 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20616989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10308491 + 10308492.

It is an arithmetic number, because the mean of its divisors is an integer number (10308492).

Almost surely, 2^20616983 is an apocalyptic number.

20616983 is a deficient number, since it is larger than the sum of its proper divisors (1).

20616983 is an equidigital number, since it uses as much as digits as its factorization.

20616983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20616983 is about 4540.5928027076. The cubic root of 20616983 is about 274.2047903346.

The spelling of 20616983 in words is "twenty million, six hundred sixteen thousand, nine hundred eighty-three".