20091528 has 48 divisors (see below), whose sum is σ = 54763020. Its totient is φ = 6654336.

The previous prime is 20091523. The next prime is 20091541. The reversal of 20091528 is 82519002.

It can be written as a sum of positive squares in 2 ways, for example, as 18301284 + 1790244 = 4278^2 + 1338^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20091523) 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, 11650 + ... + 13262.

Almost surely, 2^20091528 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 20091528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27381510).

20091528 is an abundant number, since it is smaller than the sum of its proper divisors (34671492).

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

20091528 is a wasteful number, since it uses less digits than its factorization.

20091528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798 (or 1791 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 20091528 is about 4482.3574154679. The cubic root of 20091528 is about 271.8552069618.

The spelling of 20091528 in words is "twenty million, ninety-one thousand, five hundred twenty-eight".