20380528 has 40 divisors (see below), whose sum is σ = 45358208. Its totient is φ = 8690112.

The previous prime is 20380489. The next prime is 20380537. The reversal of 20380528 is 82508302.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 20380496 and 20380505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31375 + ... + 32017.

Almost surely, 2^20380528 is an apocalyptic number.

20380528 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20380528 is an abundant number, since it is smaller than the sum of its proper divisors (24977680).

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

20380528 is a wasteful number, since it uses less digits than its factorization.

20380528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941 (or 935 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 20380528 is about 4514.4798149953. The cubic root of 20380528 is about 273.1524773589.

The spelling of 20380528 in words is "twenty million, three hundred eighty thousand, five hundred twenty-eight".