20783823 has 16 divisors (see below), whose sum is σ = 28471296. Its totient is φ = 13479840.

The previous prime is 20783813. The next prime is 20783827. The reversal of 20783823 is 32838702.

It is a happy number.

It is not a de Polignac number, because 20783823 - 2¹² = 20779727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20783827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31113 + ... + 31773.

It is an arithmetic number, because the mean of its divisors is an integer number (1779456).

Almost surely, 2^20783823 is an apocalyptic number.

20783823 is a deficient number, since it is larger than the sum of its proper divisors (7687473).

20783823 is a wasteful number, since it uses less digits than its factorization.

20783823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 20783823 is about 4558.9278344804. The cubic root of 20783823 is about 274.9424584842.

The spelling of 20783823 in words is "twenty million, seven hundred eighty-three thousand, eight hundred twenty-three".