20750000 has 70 divisors (see below), whose sum is σ = 50858724. Its totient is φ = 8200000.

The previous prime is 20749997. The next prime is 20750011. The reversal of 20750000 is 5702.

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 13 ways as a sum of consecutive naturals, for example, 249959 + ... + 250041.

Almost surely, 2^20750000 is an apocalyptic number.

20750000 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 20750000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25429362).

20750000 is an abundant number, since it is smaller than the sum of its proper divisors (30108724).

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

20750000 is an frugal number, since it uses more digits than its factorization.

20750000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 14.

The square root of 20750000 is about 4555.2167895721. The cubic root of 20750000 is about 274.7932330048.

Adding to 20750000 its reverse (5702), we get a palindrome (20755702).

The spelling of 20750000 in words is "twenty million, seven hundred fifty thousand".