20281844 has 12 divisors (see below), whose sum is σ = 38719968. Its totient is φ = 9219000.

The previous prime is 20281841. The next prime is 20281847. The reversal of 20281844 is 44818202.

It is an interprime number because it is at equal distance from previous prime (20281841) and next prime (20281847).

It is a super-2 number, since 2×20281844² = 822706392080672, which contains 22 as substring.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20281841) 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, 230432 + ... + 230519.

It is an arithmetic number, because the mean of its divisors is an integer number (3226664).

Almost surely, 2^20281844 is an apocalyptic number.

It is an amenable number.

20281844 is a deficient number, since it is larger than the sum of its proper divisors (18438124).

20281844 is a wasteful number, since it uses less digits than its factorization.

20281844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460966 (or 460964 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 20281844 is about 4503.5368323130. The cubic root of 20281844 is about 272.7108891303.

The spelling of 20281844 in words is "twenty million, two hundred eighty-one thousand, eight hundred forty-four".