20065500 has 288 divisors, whose sum is σ = 79497600. Its totient is φ = 4233600.

The previous prime is 20065489. The next prime is 20065531. The reversal of 20065500 is 556002.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1543494 + ... + 1543506.

Almost surely, 2^20065500 is an apocalyptic number.

20065500 is a gapful number since it is divisible by the number (20) 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 20065500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39748800).

20065500 is an abundant number, since it is smaller than the sum of its proper divisors (59432100).

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

20065500 is a wasteful number, since it uses less digits than its factorization.

20065500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20065500 is about 4479.4530916173. The cubic root of 20065500 is about 271.7377626830.

The spelling of 20065500 in words is "twenty million, sixty-five thousand, five hundred".