20251085 has 16 divisors (see below), whose sum is σ = 25093632. Its totient is φ = 15681600.

The previous prime is 20251081. The next prime is 20251103. The reversal of 20251085 is 58015202.

It is not a de Polignac number, because 20251085 - 2² = 20251081 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20251085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20251081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19940 + ... + 20930.

It is an arithmetic number, because the mean of its divisors is an integer number (1568352).

Almost surely, 2^20251085 is an apocalyptic number.

It is an amenable number.

20251085 is a deficient number, since it is larger than the sum of its proper divisors (4842547).

20251085 is an equidigital number, since it uses as much as digits as its factorization.

20251085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 20251085 is about 4500.1205539407. The cubic root of 20251085 is about 272.5729569264.

Adding to 20251085 its reverse (58015202), we get a palindrome (78266287).

The spelling of 20251085 in words is "twenty million, two hundred fifty-one thousand, eighty-five".