20470081 has 8 divisors (see below), whose sum is σ = 20865600. Its totient is φ = 20077680.

The previous prime is 20470061. The next prime is 20470097. The reversal of 20470081 is 18007402.

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

It is a cyclic number.

It is not a de Polignac number, because 20470081 - 2¹¹ = 20468033 is a prime.

It is a super-2 number, since 2×20470081² = 838048432293122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20470001) 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, 15630 + ... + 16888.

It is an arithmetic number, because the mean of its divisors is an integer number (2608200).

Almost surely, 2^20470081 is an apocalyptic number.

It is an amenable number.

20470081 is a deficient number, since it is larger than the sum of its proper divisors (395519).

20470081 is a wasteful number, since it uses less digits than its factorization.

20470081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 20470081 is about 4524.3873618425. The cubic root of 20470081 is about 273.5519744099.

Adding to 20470081 its reverse (18007402), we get a palindrome (38477483).

The spelling of 20470081 in words is "twenty million, four hundred seventy thousand, eighty-one".