20913736 has 16 divisors (see below), whose sum is σ = 39421440. Its totient is φ = 10401360.

The previous prime is 20913719. The next prime is 20913773. The reversal of 20913736 is 63731902.

It is a junction number, because it is equal to n+sod(n) for n = 20913698 and 20913707.

It is an unprimeable number.

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, 5316 + ... + 8371.

It is an arithmetic number, because the mean of its divisors is an integer number (2463840).

Almost surely, 2^20913736 is an apocalyptic number.

It is an amenable number.

20913736 is a deficient number, since it is larger than the sum of its proper divisors (18507704).

20913736 is a wasteful number, since it uses less digits than its factorization.

20913736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13884 (or 13880 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 20913736 is about 4573.1538351558. The cubic root of 20913736 is about 275.5141280168.

The spelling of 20913736 in words is "twenty million, nine hundred thirteen thousand, seven hundred thirty-six".