20850481 has 4 divisors (see below), whose sum is σ = 20924964. Its totient is φ = 20776000.

The previous prime is 20850463. The next prime is 20850491. The reversal of 20850481 is 18405802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7890481 + 12960000 = 2809^2 + 3600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20850481 is a prime.

It is a super-2 number, since 2×20850481² = 869485115862722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20850461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36820 + ... + 37381.

It is an arithmetic number, because the mean of its divisors is an integer number (5231241).

Almost surely, 2^20850481 is an apocalyptic number.

It is an amenable number.

20850481 is a deficient number, since it is larger than the sum of its proper divisors (74483).

20850481 is an equidigital number, since it uses as much as digits as its factorization.

20850481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74482.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 20850481 is about 4566.2326922749. The cubic root of 20850481 is about 275.2360771684.

The spelling of 20850481 in words is "twenty million, eight hundred fifty thousand, four hundred eighty-one".