20285520 has 40 divisors (see below), whose sum is σ = 62885856. Its totient is φ = 5409408.

The previous prime is 20285519. The next prime is 20285527. The reversal of 20285520 is 2558202.

It is a tau number, because it is divible by the number of its divisors (40).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20285527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42022 + ... + 42501.

Almost surely, 2^20285520 is an apocalyptic number.

20285520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20285520 is an abundant number, since it is smaller than the sum of its proper divisors (42600336).

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

20285520 is a wasteful number, since it uses less digits than its factorization.

20285520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84539 (or 84533 counting only the distinct ones).

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

The square root of 20285520 is about 4503.9449374965. The cubic root of 20285520 is about 272.7273640404.

The spelling of 20285520 in words is "twenty million, two hundred eighty-five thousand, five hundred twenty".