20447045 has 8 divisors (see below), whose sum is σ = 24775296. Its totient is φ = 16198416.

The previous prime is 20447003. The next prime is 20447057. The reversal of 20447045 is 54074402.

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 20447045 - 2²⁰ = 19398469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19337 + ... + 20366.

It is an arithmetic number, because the mean of its divisors is an integer number (3096912).

Almost surely, 2^20447045 is an apocalyptic number.

It is an amenable number.

20447045 is a deficient number, since it is larger than the sum of its proper divisors (4328251).

20447045 is a wasteful number, since it uses less digits than its factorization.

20447045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39811.

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 20447045 is about 4521.8408861878. The cubic root of 20447045 is about 273.4493220140.

The spelling of 20447045 in words is "twenty million, four hundred forty-seven thousand, forty-five".