20265381 has 24 divisors (see below), whose sum is σ = 31655520. Its totient is φ = 12449376.

The previous prime is 20265299. The next prime is 20265391. The reversal of 20265381 is 18356202.

20265381 is a `hidden beast` number, since 2 + 0 + 2 + 653 + 8 + 1 = 666.

It is not a de Polignac number, because 20265381 - 2⁷ = 20265253 is a prime.

It is a super-2 number, since 2×20265381² = 821371334150322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20265391) 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, 4726 + ... + 7928.

It is an arithmetic number, because the mean of its divisors is an integer number (1318980).

Almost surely, 2^20265381 is an apocalyptic number.

It is an amenable number.

20265381 is a deficient number, since it is larger than the sum of its proper divisors (11390139).

20265381 is a wasteful number, since it uses less digits than its factorization.

20265381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3265 (or 3262 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 20265381 is about 4501.7086756031. The cubic root of 20265381 is about 272.6370816619.

The spelling of 20265381 in words is "twenty million, two hundred sixty-five thousand, three hundred eighty-one".