20281855 has 16 divisors (see below), whose sum is σ = 26640000. Its totient is φ = 14700960.

The previous prime is 20281847. The next prime is 20281861. The reversal of 20281855 is 55818202.

It is not a de Polignac number, because 20281855 - 2³ = 20281847 is a prime.

It is a super-2 number, since 2×20281855² = 822707284482050, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27076 + ... + 27814.

It is an arithmetic number, because the mean of its divisors is an integer number (1665000).

Almost surely, 2^20281855 is an apocalyptic number.

20281855 is a deficient number, since it is larger than the sum of its proper divisors (6358145).

20281855 is a wasteful number, since it uses less digits than its factorization.

20281855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254.

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 20281855 is about 4503.5380535752. The cubic root of 20281855 is about 272.7109384325.

It can be divided in two parts, 2028 and 1855, that added together give a palindrome (3883).

The spelling of 20281855 in words is "twenty million, two hundred eighty-one thousand, eight hundred fifty-five".