20281895 has 4 divisors (see below), whose sum is σ = 24338280. Its totient is φ = 16225512.

The previous prime is 20281889. The next prime is 20281903. The reversal of 20281895 is 59818202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20281895 - 2⁴ = 20281879 is a prime.

It is a super-2 number, since 2×20281895² = 822710529582050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2028185 + ... + 2028194.

It is an arithmetic number, because the mean of its divisors is an integer number (6084570).

Almost surely, 2^20281895 is an apocalyptic number.

20281895 is a deficient number, since it is larger than the sum of its proper divisors (4056385).

20281895 is an equidigital number, since it uses as much as digits as its factorization.

20281895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4056384.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 20281895 is about 4503.5424945258. The cubic root of 20281895 is about 272.7111177131.

The spelling of 20281895 in words is "twenty million, two hundred eighty-one thousand, eight hundred ninety-five".