20408528 has 40 divisors (see below), whose sum is σ = 46163712. Its totient is φ = 8558208.

The previous prime is 20408471. The next prime is 20408533. The reversal of 20408528 is 82580402.

It is a self number, because there is not a number n which added to its sum of digits gives 20408528.

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, 3326 + ... + 7202.

Almost surely, 2^20408528 is an apocalyptic number.

20408528 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 20408528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23081856).

20408528 is an abundant number, since it is smaller than the sum of its proper divisors (25755184).

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

20408528 is a wasteful number, since it uses less digits than its factorization.

20408528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3939 (or 3933 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 20408528 is about 4517.5798830790. The cubic root of 20408528 is about 273.2775112390.

The spelling of 20408528 in words is "twenty million, four hundred eight thousand, five hundred twenty-eight".