20221356 has 12 divisors (see below), whose sum is σ = 47183192. Its totient is φ = 6740448.

The previous prime is 20221343. The next prime is 20221379. The reversal of 20221356 is 65312202.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 842545 + ... + 842568.

Almost surely, 2^20221356 is an apocalyptic number.

It is an amenable number.

20221356 is an abundant number, since it is smaller than the sum of its proper divisors (26961836).

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

20221356 is a wasteful number, since it uses less digits than its factorization.

20221356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685120 (or 1685118 counting only the distinct ones).

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

The square root of 20221356 is about 4496.8162070514. The cubic root of 20221356 is about 272.4395107439.

Adding to 20221356 its reverse (65312202), we get a palindrome (85533558).

The spelling of 20221356 in words is "twenty million, two hundred twenty-one thousand, three hundred fifty-six".