20221552 has 40 divisors (see below), whose sum is σ = 42497280. Its totient is φ = 9265920.

The previous prime is 20221549. The next prime is 20221633. The reversal of 20221552 is 25512202.

It is a super-2 number, since 2×20221552² = 817822330577408, which contains 22 as substring.

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 in 7 ways as a sum of consecutive naturals, for example, 39474 + ... + 39982.

It is an arithmetic number, because the mean of its divisors is an integer number (1062432).

Almost surely, 2^20221552 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 20221552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21248640).

20221552 is an abundant number, since it is smaller than the sum of its proper divisors (22275728).

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

20221552 is a wasteful number, since it uses less digits than its factorization.

20221552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721 (or 715 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 20221552 is about 4496.8380001952. The cubic root of 20221552 is about 272.4403909679.

Adding to 20221552 its reverse (25512202), we get a palindrome (45733754).

The spelling of 20221552 in words is "twenty million, two hundred twenty-one thousand, five hundred fifty-two".