20992842 has 72 divisors (see below), whose sum is σ = 50472864. Its totient is φ = 6301152.

The previous prime is 20992819. The next prime is 20992843. The reversal of 20992842 is 24829902.

It is a junction number, because it is equal to n+sod(n) for n = 20992797 and 20992806.

It is not an unprimeable number, because it can be changed into a prime (20992843) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 203763 + ... + 203865.

It is an arithmetic number, because the mean of its divisors is an integer number (701012).

Almost surely, 2^20992842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20992842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25236432).

20992842 is an abundant number, since it is smaller than the sum of its proper divisors (29480022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20992842 is a wasteful number, since it uses less digits than its factorization.

20992842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20992842 is about 4581.7946265628. The cubic root of 20992842 is about 275.8610674421.

The spelling of 20992842 in words is "twenty million, nine hundred ninety-two thousand, eight hundred forty-two".