20281392 has 60 divisors (see below), whose sum is σ = 57258240. Its totient is φ = 6701184.

The previous prime is 20281381. The next prime is 20281397. The reversal of 20281392 is 29318202.

It is a happy number.

It is a super-2 number, since 2×20281392² = 822669722915328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20281397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17734 + ... + 18842.

It is an arithmetic number, because the mean of its divisors is an integer number (954304).

Almost surely, 2^20281392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20281392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28629120).

20281392 is an abundant number, since it is smaller than the sum of its proper divisors (36976848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20281392 is a wasteful number, since it uses less digits than its factorization.

20281392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250 (or 1241 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20281392 is about 4503.4866492530. The cubic root of 20281392 is about 272.7088632422.

Adding to 20281392 its reverse (29318202), we get a palindrome (49599594).

The spelling of 20281392 in words is "twenty million, two hundred eighty-one thousand, three hundred ninety-two".