20280916 has 12 divisors (see below), whose sum is σ = 35553280. Its totient is φ = 10122840.

The previous prime is 20280899. The next prime is 20280919. The reversal of 20280916 is 61908202.

It is a happy number.

It is a super-2 number, since 2×20280916² = 822631107598112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20280919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1620 + ... + 6571.

Almost surely, 2^20280916 is an apocalyptic number.

It is an amenable number.

20280916 is a deficient number, since it is larger than the sum of its proper divisors (15272364).

20280916 is a wasteful number, since it uses less digits than its factorization.

20280916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8814 (or 8812 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20280916 is about 4503.4338010012. The cubic root of 20280916 is about 272.7067297523.

It can be divided in two parts, 202 and 80916, that added together give a palindrome (81118).

The spelling of 20280916 in words is "twenty million, two hundred eighty thousand, nine hundred sixteen".