20017725 has 72 divisors (see below), whose sum is σ = 41559840. Its totient is φ = 8426880.

The previous prime is 20017709. The next prime is 20017759. The reversal of 20017725 is 52771002.

It is not a de Polignac number, because 20017725 - 2⁴ = 20017709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20017695 and 20017704.

It is a congruent number.

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 71 ways as a sum of consecutive naturals, for example, 47566 + ... + 47984.

It is an arithmetic number, because the mean of its divisors is an integer number (577220).

Almost surely, 2^20017725 is an apocalyptic number.

20017725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20017725 is an abundant number, since it is smaller than the sum of its proper divisors (21542115).

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

20017725 is a wasteful number, since it uses less digits than its factorization.

20017725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459 (or 447 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 20017725 is about 4474.1172313653. The cubic root of 20017725 is about 271.5219264026.

Adding to 20017725 its reverse (52771002), we get a palindrome (72788727).

The spelling of 20017725 in words is "twenty million, seventeen thousand, seven hundred twenty-five".