20840546 has 16 divisors (see below), whose sum is σ = 32893560. Its totient is φ = 9889920.

The previous prime is 20840543. The next prime is 20840557. The reversal of 20840546 is 64504802.

It can be written as a sum of positive squares in 4 ways, for example, as 10530025 + 10310521 = 3245^2 + 3211^2 .

It is not an unprimeable number, because it can be changed into a prime (20840543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401 + ... + 6468.

Almost surely, 2^20840546 is an apocalyptic number.

20840546 is a deficient number, since it is larger than the sum of its proper divisors (12053014).

20840546 is a wasteful number, since it uses less digits than its factorization.

20840546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6949.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 20840546 is about 4565.1446855494. The cubic root of 20840546 is about 275.1923546782.

The spelling of 20840546 in words is "twenty million, eight hundred forty thousand, five hundred forty-six".