20731250 has 48 divisors (see below), whose sum is σ = 40497408. Its totient is φ = 7950000.

The previous prime is 20731247. The next prime is 20731253. The reversal of 20731250 is 5213702.

It is an interprime number because it is at equal distance from previous prime (20731247) and next prime (20731253).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731253) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 193697 + ... + 193803.

It is an arithmetic number, because the mean of its divisors is an integer number (843696).

Almost surely, 2^20731250 is an apocalyptic number.

20731250 is a deficient number, since it is larger than the sum of its proper divisors (19766158).

20731250 is an equidigital number, since it uses as much as digits as its factorization.

20731250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 20731250 is about 4553.1582445595. The cubic root of 20731250 is about 274.7104390157.

Adding to 20731250 its reverse (5213702), we get a palindrome (25944952).

The spelling of 20731250 in words is "twenty million, seven hundred thirty-one thousand, two hundred fifty".