20783943 has 6 divisors (see below), whose sum is σ = 30021264. Its totient is φ = 13855956.

The previous prime is 20783941. The next prime is 20783951. The reversal of 20783943 is 34938702.

It is not a de Polignac number, because 20783943 - 2¹ = 20783941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20783898 and 20783907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20783941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1154655 + ... + 1154672.

It is an arithmetic number, because the mean of its divisors is an integer number (5003544).

Almost surely, 2^20783943 is an apocalyptic number.

20783943 is a deficient number, since it is larger than the sum of its proper divisors (9237321).

20783943 is a wasteful number, since it uses less digits than its factorization.

20783943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309333 (or 2309330 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 20783943 is about 4558.9409954506. The cubic root of 20783943 is about 274.9429876302.

The spelling of 20783943 in words is "twenty million, seven hundred eighty-three thousand, nine hundred forty-three".