20020656 has 20 divisors (see below), whose sum is σ = 51720152. Its totient is φ = 6673536.

The previous prime is 20020633. The next prime is 20020673. The reversal of 20020656 is 65602002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208501 + ... + 208596.

Almost surely, 2^20020656 is an apocalyptic number.

It is an amenable number.

20020656 is an abundant number, since it is smaller than the sum of its proper divisors (31699496).

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

20020656 is a wasteful number, since it uses less digits than its factorization.

20020656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417108 (or 417102 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20020656 is about 4474.4447700245. Note that the first 3 decimals coincide. The cubic root of 20020656 is about 271.5351778573.

Adding to 20020656 its reverse (65602002), we get a palindrome (85622658).

The spelling of 20020656 in words is "twenty million, twenty thousand, six hundred fifty-six".