20220288 has 64 divisors (see below), whose sum is σ = 58605120. Its totient is φ = 6126080.

The previous prime is 20220283. The next prime is 20220307. The reversal of 20220288 is 88202202.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20220283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1831 + ... + 6617.

It is an arithmetic number, because the mean of its divisors is an integer number (915705).

Almost surely, 2^20220288 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 20220288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29302560).

20220288 is an abundant number, since it is smaller than the sum of its proper divisors (38384832).

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

20220288 is a wasteful number, since it uses less digits than its factorization.

20220288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4815 (or 4803 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 20220288 is about 4496.6974547995. The cubic root of 20220288 is about 272.4347143211.

The spelling of 20220288 in words is "twenty million, two hundred twenty thousand, two hundred eighty-eight".