20833945 has 16 divisors (see below), whose sum is σ = 27941760. Its totient is φ = 14780800.

The previous prime is 20833931. The next prime is 20833949. The reversal of 20833945 is 54933802.

20833945 = 463² + 464² + ... + 544².

It is a happy number.

It is not a de Polignac number, because 20833945 - 2⁹ = 20833433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20833945.

It is not an unprimeable number, because it can be changed into a prime (20833949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2365 + ... + 6874.

It is an arithmetic number, because the mean of its divisors is an integer number (1746360).

Almost surely, 2^20833945 is an apocalyptic number.

It is an amenable number.

20833945 is a deficient number, since it is larger than the sum of its proper divisors (7107815).

20833945 is a wasteful number, since it uses less digits than its factorization.

20833945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9296.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 20833945 is about 4564.4216501108. The cubic root of 20833945 is about 275.1632969533.

The spelling of 20833945 in words is "twenty million, eight hundred thirty-three thousand, nine hundred forty-five".