20942823 has 16 divisors (see below), whose sum is σ = 30560256. Its totient is φ = 12651840.

The previous prime is 20942813. The next prime is 20942833. The reversal of 20942823 is 32824902.

It is an interprime number because it is at equal distance from previous prime (20942813) and next prime (20942833).

It is not a de Polignac number, because 20942823 - 2¹⁷ = 20811751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20942813) 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, 11811 + ... + 13467.

It is an arithmetic number, because the mean of its divisors is an integer number (1910016).

Almost surely, 2^20942823 is an apocalyptic number.

20942823 is a deficient number, since it is larger than the sum of its proper divisors (9617433).

20942823 is a wasteful number, since it uses less digits than its factorization.

20942823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20942823 is about 4576.3329205817. The cubic root of 20942823 is about 275.6417979694.

The spelling of 20942823 in words is "twenty million, nine hundred forty-two thousand, eight hundred twenty-three".