20945816 has 16 divisors (see below), whose sum is σ = 40187400. Its totient is φ = 10229184.

The previous prime is 20945807. The next prime is 20945833. The reversal of 20945816 is 61854902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30101 + ... + 30788.

Almost surely, 2^20945816 is an apocalyptic number.

It is an amenable number.

20945816 is a deficient number, since it is larger than the sum of its proper divisors (19241584).

20945816 is a wasteful number, since it uses less digits than its factorization.

20945816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60938 (or 60934 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 20945816 is about 4576.6599174507. The cubic root of 20945816 is about 275.6549282688.

The spelling of 20945816 in words is "twenty million, nine hundred forty-five thousand, eight hundred sixteen".