20545816 has 16 divisors (see below), whose sum is σ = 38598840. Its totient is φ = 10252800.

The previous prime is 20545807. The next prime is 20545817. The reversal of 20545816 is 61854502.

It is a super-3 number, since 3×20545816³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20545817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2391 + ... + 6841.

Almost surely, 2^20545816 is an apocalyptic number.

It is an amenable number.

20545816 is a deficient number, since it is larger than the sum of its proper divisors (18053024).

20545816 is a wasteful number, since it uses less digits than its factorization.

20545816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5034 (or 5030 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 20545816 is about 4532.7492761016. The cubic root of 20545816 is about 273.8889208227. Note that the first 3 decimals are identical.

The spelling of 20545816 in words is "twenty million, five hundred forty-five thousand, eight hundred sixteen".