20783949 has 8 divisors (see below), whose sum is σ = 27754272. Its totient is φ = 13834800.

The previous prime is 20783941. The next prime is 20783951. The reversal of 20783949 is 94938702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20783949 - 2³ = 20783941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20783949.

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 7 ways as a sum of consecutive naturals, for example, 2839 + ... + 7044.

It is an arithmetic number, because the mean of its divisors is an integer number (3469284).

Almost surely, 2^20783949 is an apocalyptic number.

It is an amenable number.

20783949 is a deficient number, since it is larger than the sum of its proper divisors (6970323).

20783949 is an equidigital number, since it uses as much as digits as its factorization.

20783949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10587.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 20783949 is about 4558.9416534981. The cubic root of 20783949 is about 274.9430140874.

The spelling of 20783949 in words is "twenty million, seven hundred eighty-three thousand, nine hundred forty-nine".