20634500 has 24 divisors (see below), whose sum is σ = 45066840. Its totient is φ = 8253600.

The previous prime is 20634487. The next prime is 20634511. The reversal of 20634500 is 543602.

It can be written as a sum of positive squares in 4 ways, for example, as 5827396 + 14807104 = 2414^2 + 3848^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20135 + ... + 21134.

It is an arithmetic number, because the mean of its divisors is an integer number (1877785).

Almost surely, 2^20634500 is an apocalyptic number.

20634500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20634500 is an abundant number, since it is smaller than the sum of its proper divisors (24432340).

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

20634500 is a wasteful number, since it uses less digits than its factorization.

20634500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41288 (or 41276 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20634500 is about 4542.5213263121. The cubic root of 20634500 is about 274.2824267442.

The spelling of 20634500 in words is "twenty million, six hundred thirty-four thousand, five hundred".