20980481 has 2 divisors, whose sum is σ = 20980482. Its totient is φ = 20980480.

The previous prime is 20980469. The next prime is 20980483. The reversal of 20980481 is 18408902.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20106256 + 874225 = 4484^2 + 935^2 .

It is a cyclic number.

It is not a de Polignac number, because 20980481 - 2⁶ = 20980417 is a prime.

It is a super-2 number, since 2×20980481² = 880361165982722, which contains 22 as substring.

Together with 20980483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20980483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10490240 + 10490241.

It is an arithmetic number, because the mean of its divisors is an integer number (10490241).

Almost surely, 2^20980481 is an apocalyptic number.

It is an amenable number.

20980481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20980481 is an equidigital number, since it uses as much as digits as its factorization.

20980481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 20980481 is about 4580.4455023502. The cubic root of 20980481 is about 275.8069126632.

The spelling of 20980481 in words is "twenty million, nine hundred eighty thousand, four hundred eighty-one".