20281064 has 16 divisors (see below), whose sum is σ = 38836800. Its totient is φ = 9924592.

The previous prime is 20281049. The next prime is 20281067. The reversal of 20281064 is 46018202.

It is a super-2 number, since 2×20281064² = 822643113944192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20281067) 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, 26594 + ... + 27345.

It is an arithmetic number, because the mean of its divisors is an integer number (2427300).

Almost surely, 2^20281064 is an apocalyptic number.

It is an amenable number.

20281064 is a deficient number, since it is larger than the sum of its proper divisors (18555736).

20281064 is a wasteful number, since it uses less digits than its factorization.

20281064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53992 (or 53988 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 20281064 is about 4503.4502328770. The cubic root of 20281064 is about 272.7073931099.

Adding to 20281064 its reverse (46018202), we get a palindrome (66299266).

The spelling of 20281064 in words is "twenty million, two hundred eighty-one thousand, sixty-four".