20628888 has 128 divisors (see below), whose sum is σ = 64696320. Its totient is φ = 5345280.

The previous prime is 20628887. The next prime is 20628899. The reversal of 20628888 is 88882602.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20628887) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88420 + ... + 88652.

It is an arithmetic number, because the mean of its divisors is an integer number (505440).

Almost surely, 2^20628888 is an apocalyptic number.

20628888 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20628888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32348160).

20628888 is an abundant number, since it is smaller than the sum of its proper divisors (44067432).

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

20628888 is a wasteful number, since it uses less digits than its factorization.

20628888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 42.

The square root of 20628888 is about 4541.9035656870. The cubic root of 20628888 is about 274.2575588039.

The spelling of 20628888 in words is "twenty million, six hundred twenty-eight thousand, eight hundred eighty-eight".