20516236 has 24 divisors (see below), whose sum is σ = 39612384. Its totient is φ = 9237120.

The previous prime is 20516233. The next prime is 20516239. The reversal of 20516236 is 63261502.

It is an interprime number because it is at equal distance from previous prime (20516233) and next prime (20516239).

It is a self number, because there is not a number n which added to its sum of digits gives 20516236.

It is not an unprimeable number, because it can be changed into a prime (20516233) 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 7 ways as a sum of consecutive naturals, for example, 2680 + ... + 6943.

It is an arithmetic number, because the mean of its divisors is an integer number (1650516).

Almost surely, 2^20516236 is an apocalyptic number.

20516236 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20516236 is a deficient number, since it is larger than the sum of its proper divisors (19096148).

20516236 is a wasteful number, since it uses less digits than its factorization.

20516236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9681 (or 9679 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20516236 is about 4529.4851804593. The cubic root of 20516236 is about 273.7574175621.

Adding to 20516236 its reverse (63261502), we get a palindrome (83777738).

The spelling of 20516236 in words is "twenty million, five hundred sixteen thousand, two hundred thirty-six".