20632905 has 24 divisors (see below), whose sum is σ = 36598848. Its totient is φ = 10747296.

The previous prime is 20632889. The next prime is 20632919. The reversal of 20632905 is 50923602.

20632905 is a `hidden beast` number, since 20 + 632 + 9 + 0 + 5 = 666.

It is not a de Polignac number, because 20632905 - 2⁴ = 20632889 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 3397 + ... + 7266.

It is an arithmetic number, because the mean of its divisors is an integer number (1524952).

Almost surely, 2^20632905 is an apocalyptic number.

It is an amenable number.

20632905 is a deficient number, since it is larger than the sum of its proper divisors (15965943).

20632905 is a wasteful number, since it uses less digits than its factorization.

20632905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10717 (or 10714 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 20632905 is about 4542.3457596268. The cubic root of 20632905 is about 274.2753594259.

The spelling of 20632905 in words is "twenty million, six hundred thirty-two thousand, nine hundred five".