20281893 has 8 divisors (see below), whose sum is σ = 27064800. Its totient is φ = 13510128.

The previous prime is 20281889. The next prime is 20281903. The reversal of 20281893 is 39818202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20281893 - 2² = 20281889 is a prime.

It is a super-2 number, since 2×20281893² = 822710367326898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20281823) 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 7 ways as a sum of consecutive naturals, for example, 3478 + ... + 7256.

It is an arithmetic number, because the mean of its divisors is an integer number (3383100).

Almost surely, 2^20281893 is an apocalyptic number.

It is an amenable number.

20281893 is a deficient number, since it is larger than the sum of its proper divisors (6782907).

20281893 is a wasteful number, since it uses less digits than its factorization.

20281893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5571.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 20281893 is about 4503.5422724784. The cubic root of 20281893 is about 272.7111087491.

The spelling of 20281893 in words is "twenty million, two hundred eighty-one thousand, eight hundred ninety-three".