20021796 has 48 divisors (see below), whose sum is σ = 52516800. Its totient is φ = 6595776.

The previous prime is 20021759. The next prime is 20021821. The reversal of 20021796 is 69712002.

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

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, 8571 + ... + 10653.

It is an arithmetic number, because the mean of its divisors is an integer number (1094100).

Almost surely, 2^20021796 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 20021796, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26258400).

20021796 is an abundant number, since it is smaller than the sum of its proper divisors (32495004).

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

20021796 is a wasteful number, since it uses less digits than its factorization.

20021796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2185 (or 2177 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 20021796 is about 4474.5721583186. The cubic root of 20021796 is about 271.5403316049.

Adding to 20021796 its reverse (69712002), we get a palindrome (89733798).

The spelling of 20021796 in words is "twenty million, twenty-one thousand, seven hundred ninety-six".