20910481 has 2 divisors, whose sum is σ = 20910482. Its totient is φ = 20910480.

The previous prime is 20910467. The next prime is 20910497. The reversal of 20910481 is 18401902.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12006225 + 8904256 = 3465^2 + 2984^2 .

It is a cyclic number.

It is not a de Polignac number, because 20910481 - 2⁷ = 20910353 is a prime.

It is a super-2 number, since 2×20910481² = 874496431302722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20910401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10455240 + 10455241.

It is an arithmetic number, because the mean of its divisors is an integer number (10455241).

Almost surely, 2^20910481 is an apocalyptic number.

It is an amenable number.

20910481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20910481 is an equidigital number, since it uses as much as digits as its factorization.

20910481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 20910481 is about 4572.7979399925. The cubic root of 20910481 is about 275.4998336632.

The spelling of 20910481 in words is "twenty million, nine hundred ten thousand, four hundred eighty-one".