20380428 has 36 divisors (see below), whose sum is σ = 51666888. Its totient is φ = 6773760.

The previous prime is 20380427. The next prime is 20380439. The reversal of 20380428 is 82408302.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (20380427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17100 + ... + 18252.

Almost surely, 2^20380428 is an apocalyptic number.

It is an amenable number.

20380428 is an abundant number, since it is smaller than the sum of its proper divisors (31286460).

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

20380428 is a wasteful number, since it uses less digits than its factorization.

20380428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654 (or 1649 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20380428 is about 4514.4687395086. The cubic root of 20380428 is about 273.1520306041.

The spelling of 20380428 in words is "twenty million, three hundred eighty thousand, four hundred twenty-eight".