20520528 has 80 divisors (see below), whose sum is σ = 61127040. Its totient is φ = 5810688.

The previous prime is 20520527. The next prime is 20520553. The reversal of 20520528 is 82502502.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 20520498 and 20520507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52558 + ... + 52946.

It is an arithmetic number, because the mean of its divisors is an integer number (764088).

Almost surely, 2^20520528 is an apocalyptic number.

20520528 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 20520528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30563520).

20520528 is an abundant number, since it is smaller than the sum of its proper divisors (40606512).

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

20520528 is a wasteful number, since it uses less digits than its factorization.

20520528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564 (or 558 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 20520528 is about 4529.9589402113. The cubic root of 20520528 is about 273.7765062635.

The spelling of 20520528 in words is "twenty million, five hundred twenty thousand, five hundred twenty-eight".