20980471 has 8 divisors (see below), whose sum is σ = 21493440. Its totient is φ = 20470368.

The previous prime is 20980469. The next prime is 20980481. The reversal of 20980471 is 17408902.

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 20980471 - 2¹ = 20980469 is a prime.

It is a super-3 number, since 3×20980471³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20980441) 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 7 ways as a sum of consecutive naturals, for example, 23485 + ... + 24361.

It is an arithmetic number, because the mean of its divisors is an integer number (2686680).

Almost surely, 2^20980471 is an apocalyptic number.

20980471 is a deficient number, since it is larger than the sum of its proper divisors (512969).

20980471 is an equidigital number, since it uses as much as digits as its factorization.

20980471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1433.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20980471 is about 4580.4444107532. Note that the first 4 decimals coincide. The cubic root of 20980471 is about 275.8068688436.

The spelling of 20980471 in words is "twenty million, nine hundred eighty thousand, four hundred seventy-one".