20281845 has 8 divisors (see below), whose sum is σ = 32450976. Its totient is φ = 10816976.

The previous prime is 20281841. The next prime is 20281847. The reversal of 20281845 is 54818202.

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

It is a cyclic number.

It is not a de Polignac number, because 20281845 - 2² = 20281841 is a prime.

It is a super-2 number, since 2×20281845² = 822706473208050, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 676047 + ... + 676076.

It is an arithmetic number, because the mean of its divisors is an integer number (4056372).

Almost surely, 2^20281845 is an apocalyptic number.

It is an amenable number.

20281845 is a deficient number, since it is larger than the sum of its proper divisors (12169131).

20281845 is a wasteful number, since it uses less digits than its factorization.

20281845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352131.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 20281845 is about 4503.5369433369. The cubic root of 20281845 is about 272.7108936123.

The spelling of 20281845 in words is "twenty million, two hundred eighty-one thousand, eight hundred forty-five".