20816632 has 32 divisors (see below), whose sum is σ = 40245120. Its totient is φ = 10090080.

The previous prime is 20816623. The next prime is 20816659. The reversal of 20816632 is 23661802.

It is a self number, because there is not a number n which added to its sum of digits gives 20816632.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37783 + ... + 38329.

It is an arithmetic number, because the mean of its divisors is an integer number (1257660).

Almost surely, 2^20816632 is an apocalyptic number.

It is an amenable number.

20816632 is a deficient number, since it is larger than the sum of its proper divisors (19428488).

20816632 is a wasteful number, since it uses less digits than its factorization.

20816632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691 (or 687 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20816632 is about 4562.5247396590. The cubic root of 20816632 is about 275.0870556338.

The spelling of 20816632 in words is "twenty million, eight hundred sixteen thousand, six hundred thirty-two".