20906470 has 32 divisors (see below), whose sum is σ = 41100192. Its totient is φ = 7610112.

The previous prime is 20906461. The next prime is 20906489. The reversal of 20906470 is 7460902.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 8389 + ... + 10591.

It is an arithmetic number, because the mean of its divisors is an integer number (1284381).

Almost surely, 2^20906470 is an apocalyptic number.

20906470 is a deficient number, since it is larger than the sum of its proper divisors (20193722).

20906470 is a wasteful number, since it uses less digits than its factorization.

20906470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20906470 is about 4572.3593472080. The cubic root of 20906470 is about 275.4822172902.

The spelling of 20906470 in words is "twenty million, nine hundred six thousand, four hundred seventy".