20949470 has 16 divisors (see below), whose sum is σ = 37802160. Its totient is φ = 8359104.

The previous prime is 20949421. The next prime is 20949499. The reversal of 20949470 is 7494902.

It is a self number, because there is not a number n which added to its sum of digits gives 20949470.

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, 2066 + ... + 6794.

It is an arithmetic number, because the mean of its divisors is an integer number (2362635).

Almost surely, 2^20949470 is an apocalyptic number.

20949470 is a deficient number, since it is larger than the sum of its proper divisors (16852690).

20949470 is a wasteful number, since it uses less digits than its factorization.

20949470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5179.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20949470 is about 4577.0590994655. The cubic root of 20949470 is about 275.6709566813.

The spelling of 20949470 in words is "twenty million, nine hundred forty-nine thousand, four hundred seventy".