20506000 has 40 divisors (see below), whose sum is σ = 49588344. Its totient is φ = 8201600.

The previous prime is 20505983. The next prime is 20506001. The reversal of 20506000 is 60502.

It can be written as a sum of positive squares in 4 ways, for example, as 3564544 + 16941456 = 1888^2 + 4116^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20506001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3127 + ... + 7126.

Almost surely, 2^20506000 is an apocalyptic number.

20506000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20506000 is an abundant number, since it is smaller than the sum of its proper divisors (29082344).

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

20506000 is a wasteful number, since it uses less digits than its factorization.

20506000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10276 (or 10260 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 20506000 is about 4528.3551097501. The cubic root of 20506000 is about 273.7118821289.

Adding to 20506000 its reverse (60502), we get a palindrome (20566502).

The spelling of 20506000 in words is "twenty million, five hundred six thousand".