20853937 has 4 divisors (see below), whose sum is σ = 22458100. Its totient is φ = 19249776.

The previous prime is 20853923. The next prime is 20853941. The reversal of 20853937 is 73935802.

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 6948496 + 13905441 = 2636^2 + 3729^2 .

It is not a de Polignac number, because 20853937 - 2¹⁹ = 20329649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20853896 and 20853905.

It is not an unprimeable number, because it can be changed into a prime (20853037) 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, 802062 + ... + 802087.

It is an arithmetic number, because the mean of its divisors is an integer number (5614525).

Almost surely, 2^20853937 is an apocalyptic number.

It is an amenable number.

20853937 is a deficient number, since it is larger than the sum of its proper divisors (1604163).

20853937 is a wasteful number, since it uses less digits than its factorization.

20853937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604162.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 20853937 is about 4566.6111067180. The cubic root of 20853937 is about 275.2512832658.

It can be divided in two parts, 208 and 53937, that added together give a palindrome (54145).

The spelling of 20853937 in words is "twenty million, eight hundred fifty-three thousand, nine hundred thirty-seven".