20508416 has 18 divisors (see below), whose sum is σ = 40937232. Its totient is φ = 10254080.

The previous prime is 20508413. The next prime is 20508431. The reversal of 20508416 is 61480502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20508413) 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 as a sum of consecutive naturals, namely, 39800 + ... + 40311.

Almost surely, 2^20508416 is an apocalyptic number.

It is an amenable number.

20508416 is a deficient number, since it is larger than the sum of its proper divisors (20428816).

20508416 is an frugal number, since it uses more digits than its factorization.

20508416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80127 (or 80113 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 20508416 is about 4528.6218654244. The cubic root of 20508416 is about 273.7226312095.

Adding to 20508416 its reverse (61480502), we get a palindrome (81988918).

The spelling of 20508416 in words is "twenty million, five hundred eight thousand, four hundred sixteen".