20841481 has 2 divisors, whose sum is σ = 20841482. Its totient is φ = 20841480.

The previous prime is 20841463. The next prime is 20841523. The reversal of 20841481 is 18414802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20169081 + 672400 = 4491^2 + 820^2 .

It is a cyclic number.

It is not a de Polignac number, because 20841481 - 2¹⁵ = 20808713 is a prime.

It is a super-2 number, since 2×20841481² = 868734660546722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20841421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10420740 + 10420741.

It is an arithmetic number, because the mean of its divisors is an integer number (10420741).

Almost surely, 2^20841481 is an apocalyptic number.

It is an amenable number.

20841481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20841481 is an equidigital number, since it uses as much as digits as its factorization.

20841481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 20841481 is about 4565.2470907937. The cubic root of 20841481 is about 275.1964700695.

The spelling of 20841481 in words is "twenty million, eight hundred forty-one thousand, four hundred eighty-one".