20725090 has 16 divisors (see below), whose sum is σ = 38215800. Its totient is φ = 8087680.

The previous prime is 20725051. The next prime is 20725123. The reversal of 20725090 is 9052702.

It can be written as a sum of positive squares in 4 ways, for example, as 14115049 + 6610041 = 3757^2 + 2571^2 .

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 7 ways as a sum of consecutive naturals, for example, 24865 + ... + 25684.

Almost surely, 2^20725090 is an apocalyptic number.

20725090 is a deficient number, since it is larger than the sum of its proper divisors (17490710).

20725090 is a wasteful number, since it uses less digits than its factorization.

20725090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50597.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 20725090 is about 4552.4817407651. The cubic root of 20725090 is about 274.6832275364.

Adding to 20725090 its reverse (9052702), we get a palindrome (29777792).

The spelling of 20725090 in words is "twenty million, seven hundred twenty-five thousand, ninety".