20025181 has 4 divisors (see below), whose sum is σ = 21845664. Its totient is φ = 18204700.

The previous prime is 20025151. The next prime is 20025191. The reversal of 20025181 is 18152002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20025181 - 2¹⁹ = 19500893 is a prime.

It is a super-2 number, since 2×20025181² = 802015748165522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20025121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 910225 + ... + 910246.

It is an arithmetic number, because the mean of its divisors is an integer number (5461416).

Almost surely, 2^20025181 is an apocalyptic number.

It is an amenable number.

20025181 is a deficient number, since it is larger than the sum of its proper divisors (1820483).

20025181 is a wasteful number, since it uses less digits than its factorization.

20025181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820482.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 20025181 is about 4474.9503907865. The cubic root of 20025181 is about 271.5556334661. Note that the first 3 decimals are identical.

Adding to 20025181 its reverse (18152002), we get a palindrome (38177183).

The spelling of 20025181 in words is "twenty million, twenty-five thousand, one hundred eighty-one".