20783906 has 16 divisors (see below), whose sum is σ = 36626688. Its totient is φ = 8720400.

The previous prime is 20783887. The next prime is 20783941. The reversal of 20783906 is 60938702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36050 + ... + 36621.

It is an arithmetic number, because the mean of its divisors is an integer number (2289168).

Almost surely, 2^20783906 is an apocalyptic number.

20783906 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20783906 is a deficient number, since it is larger than the sum of its proper divisors (15842782).

20783906 is a wasteful number, since it uses less digits than its factorization.

20783906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72697.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20783906 is about 4558.9369374888. The cubic root of 20783906 is about 274.9428244770.

The spelling of 20783906 in words is "twenty million, seven hundred eighty-three thousand, nine hundred six".