20633983 has 2 divisors, whose sum is σ = 20633984. Its totient is φ = 20633982.

The previous prime is 20633959. The next prime is 20634001. The reversal of 20633983 is 38933602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20633983 is a prime.

It is a super-2 number, since 2×20633983² = 851522508888578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20633933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10316991 + 10316992.

It is an arithmetic number, because the mean of its divisors is an integer number (10316992).

Almost surely, 2^20633983 is an apocalyptic number.

20633983 is a deficient number, since it is larger than the sum of its proper divisors (1).

20633983 is an equidigital number, since it uses as much as digits as its factorization.

20633983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 20633983 is about 4542.4644192332. The cubic root of 20633983 is about 274.2801359982.

The spelling of 20633983 in words is "twenty million, six hundred thirty-three thousand, nine hundred eighty-three".