20388828 has 12 divisors (see below), whose sum is σ = 47573960. Its totient is φ = 6796272.

The previous prime is 20388821. The next prime is 20388829. The reversal of 20388828 is 82888302.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20388821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 849523 + ... + 849546.

Almost surely, 2^20388828 is an apocalyptic number.

It is an amenable number.

20388828 is an abundant number, since it is smaller than the sum of its proper divisors (27185132).

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

20388828 is a wasteful number, since it uses less digits than its factorization.

20388828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1699076 (or 1699074 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 39.

The square root of 20388828 is about 4515.3989856933. The cubic root of 20388828 is about 273.1895529090.

The spelling of 20388828 in words is "twenty million, three hundred eighty-eight thousand, eight hundred twenty-eight".