20470785 has 8 divisors (see below), whose sum is σ = 32753280. Its totient is φ = 10917744.

The previous prime is 20470777. The next prime is 20470789. The reversal of 20470785 is 58707402.

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

It is not a de Polignac number, because 20470785 - 2³ = 20470777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20470789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 682345 + ... + 682374.

It is an arithmetic number, because the mean of its divisors is an integer number (4094160).

Almost surely, 2^20470785 is an apocalyptic number.

It is an amenable number.

20470785 is a deficient number, since it is larger than the sum of its proper divisors (12282495).

20470785 is a wasteful number, since it uses less digits than its factorization.

20470785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364727.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 20470785 is about 4524.4651617622. The cubic root of 20470785 is about 273.5551103425. Note that the first 3 decimals are identical.

The spelling of 20470785 in words is "twenty million, four hundred seventy thousand, seven hundred eighty-five".