20975000 has 48 divisors (see below), whose sum is σ = 49215600. Its totient is φ = 8380000.

The previous prime is 20974999. The next prime is 20975051. The reversal of 20975000 is 57902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24581 + ... + 25419.

It is an arithmetic number, because the mean of its divisors is an integer number (1025325).

Almost surely, 2^20975000 is an apocalyptic number.

20975000 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 20975000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24607800).

20975000 is an abundant number, since it is smaller than the sum of its proper divisors (28240600).

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

20975000 is an frugal number, since it uses more digits than its factorization.

20975000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870 (or 846 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 20975000 is about 4579.8471590218. The cubic root of 20975000 is about 275.7828930464.

The spelling of 20975000 in words is "twenty million, nine hundred seventy-five thousand".