20546645 has 32 divisors (see below), whose sum is σ = 30136320. Its totient is φ = 13144320.

The previous prime is 20546633. The next prime is 20546651. The reversal of 20546645 is 54664502.

It is not a de Polignac number, because 20546645 - 2¹⁴ = 20530261 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 31139 + ... + 31791.

It is an arithmetic number, because the mean of its divisors is an integer number (941760).

Almost surely, 2^20546645 is an apocalyptic number.

It is an amenable number.

20546645 is a deficient number, since it is larger than the sum of its proper divisors (9589675).

20546645 is a wasteful number, since it uses less digits than its factorization.

20546645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725.

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 20546645 is about 4532.8407207843. The cubic root of 20546645 is about 273.8926044739.

The spelling of 20546645 in words is "twenty million, five hundred forty-six thousand, six hundred forty-five".