20842056 has 64 divisors (see below), whose sum is σ = 59155200. Its totient is φ = 6796224.

The previous prime is 20842049. The next prime is 20842093. The reversal of 20842056 is 65024802.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9126 + ... + 11178.

It is an arithmetic number, because the mean of its divisors is an integer number (924300).

Almost surely, 2^20842056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20842056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29577600).

20842056 is an abundant number, since it is smaller than the sum of its proper divisors (38313144).

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

20842056 is a wasteful number, since it uses less digits than its factorization.

20842056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115 (or 2105 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20842056 is about 4565.3100661401. The cubic root of 20842056 is about 275.1990008640.

Adding to 20842056 its reverse (65024802), we get a palindrome (85866858).

The spelling of 20842056 in words is "twenty million, eight hundred forty-two thousand, fifty-six".