20211056 has 10 divisors (see below), whose sum is σ = 39158952. Its totient is φ = 10105520.

The previous prime is 20211031. The next prime is 20211077. The reversal of 20211056 is 65011202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631580 + ... + 631611.

Almost surely, 2^20211056 is an apocalyptic number.

It is an amenable number.

20211056 is a deficient number, since it is larger than the sum of its proper divisors (18947896).

20211056 is a wasteful number, since it uses less digits than its factorization.

20211056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263199 (or 1263193 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 20211056 is about 4495.6708064537. The cubic root of 20211056 is about 272.3932460664.

Adding to 20211056 its reverse (65011202), we get a palindrome (85222258).

The spelling of 20211056 in words is "twenty million, two hundred eleven thousand, fifty-six".