20833813 has 24 divisors (see below), whose sum is σ = 28143936. Its totient is φ = 14976000.

The previous prime is 20833811. The next prime is 20833859. The reversal of 20833813 is 31833802.

It is not a de Polignac number, because 20833813 - 2¹ = 20833811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20833811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12213 + ... + 13813.

It is an arithmetic number, because the mean of its divisors is an integer number (1172664).

Almost surely, 2^20833813 is an apocalyptic number.

It is an amenable number.

20833813 is a deficient number, since it is larger than the sum of its proper divisors (7310123).

20833813 is a wasteful number, since it uses less digits than its factorization.

20833813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645 (or 1632 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20833813 is about 4564.4071904246. The cubic root of 20833813 is about 275.1627158243.

It can be divided in two parts, 208 and 33813, that multiplied together give a square (7033104 = 2652²).

The spelling of 20833813 in words is "twenty million, eight hundred thirty-three thousand, eight hundred thirteen".