20672500 has 30 divisors (see below), whose sum is σ = 45212090. Its totient is φ = 8268000.

The previous prime is 20672471. The next prime is 20672501. The reversal of 20672500 is 527602.

It can be written as a sum of positive squares in 5 ways, for example, as 3549456 + 17123044 = 1884^2 + 4138^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20672501) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 1635 + ... + 6634.

Almost surely, 2^20672500 is an apocalyptic number.

20672500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20672500 is an abundant number, since it is smaller than the sum of its proper divisors (24539590).

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

20672500 is an equidigital number, since it uses as much as digits as its factorization.

20672500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8293 (or 8276 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20672500 is about 4546.7021015237. The cubic root of 20672500 is about 274.4506941390.

The spelling of 20672500 in words is "twenty million, six hundred seventy-two thousand, five hundred".