20470881 has 16 divisors (see below), whose sum is σ = 28835840. Its totient is φ = 12897360.

The previous prime is 20470867. The next prime is 20470883. The reversal of 20470881 is 18807402.

It is not a de Polignac number, because 20470881 - 2⁷ = 20470753 is a prime.

It is a super-2 number, since 2×20470881² = 838113937832322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20470883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1440 + ... + 6558.

It is an arithmetic number, because the mean of its divisors is an integer number (1802240).

Almost surely, 2^20470881 is an apocalyptic number.

It is an amenable number.

20470881 is a deficient number, since it is larger than the sum of its proper divisors (8364959).

20470881 is a wasteful number, since it uses less digits than its factorization.

20470881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5196.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 20470881 is about 4524.4757707385. The cubic root of 20470881 is about 273.5555379641. Note that the first 4 decimals are identical.

The spelling of 20470881 in words is "twenty million, four hundred seventy thousand, eight hundred eighty-one".