20545500 has 48 divisors (see below), whose sum is σ = 59832864. Its totient is φ = 5478400.

The previous prime is 20545493. The next prime is 20545531. The reversal of 20545500 is 554502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5349 + ... + 8348.

It is an arithmetic number, because the mean of its divisors is an integer number (1246518).

Almost surely, 2^20545500 is an apocalyptic number.

20545500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20545500 is an abundant number, since it is smaller than the sum of its proper divisors (39287364).

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

20545500 is a wasteful number, since it uses less digits than its factorization.

20545500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13719 (or 13707 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 20545500 is about 4532.7144185355. The cubic root of 20545500 is about 273.8875166545.

The spelling of 20545500 in words is "twenty million, five hundred forty-five thousand, five hundred".