20811470 has 8 divisors (see below), whose sum is σ = 37460664. Its totient is φ = 8324584.

The previous prime is 20811467. The next prime is 20811487. The reversal of 20811470 is 7411802.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1040564 + ... + 1040583.

It is an arithmetic number, because the mean of its divisors is an integer number (4682583).

Almost surely, 2^20811470 is an apocalyptic number.

20811470 is a deficient number, since it is larger than the sum of its proper divisors (16649194).

20811470 is a wasteful number, since it uses less digits than its factorization.

20811470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2081154.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 20811470 is about 4561.9590090223. The cubic root of 20811470 is about 275.0643155356.

The spelling of 20811470 in words is "twenty million, eight hundred eleven thousand, four hundred seventy".