20392005 has 8 divisors (see below), whose sum is σ = 32627232. Its totient is φ = 10875728.

The previous prime is 20391979. The next prime is 20392013. The reversal of 20392005 is 50029302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20392005 - 2¹² = 20387909 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 7 ways as a sum of consecutive naturals, for example, 679719 + ... + 679748.

It is an arithmetic number, because the mean of its divisors is an integer number (4078404).

Almost surely, 2^20392005 is an apocalyptic number.

It is an amenable number.

20392005 is a deficient number, since it is larger than the sum of its proper divisors (12235227).

20392005 is a wasteful number, since it uses less digits than its factorization.

20392005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359475.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 20392005 is about 4515.7507681448. The cubic root of 20392005 is about 273.2037416947.

The spelling of 20392005 in words is "twenty million, three hundred ninety-two thousand, five".