20853923 has 2 divisors, whose sum is σ = 20853924. Its totient is φ = 20853922.

The previous prime is 20853913. The next prime is 20853941. The reversal of 20853923 is 32935802.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20853923 is a prime.

It is a super-2 number, since 2×20853923² = 869772208979858, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20853923.

It is not a weakly prime, because it can be changed into another prime (20853913) 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 as a sum of consecutive naturals, namely, 10426961 + 10426962.

It is an arithmetic number, because the mean of its divisors is an integer number (10426962).

Almost surely, 2^20853923 is an apocalyptic number.

20853923 is a deficient number, since it is larger than the sum of its proper divisors (1).

20853923 is an equidigital number, since it uses as much as digits as its factorization.

20853923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 20853923 is about 4566.6095738524. The cubic root of 20853923 is about 275.2512216704.

The spelling of 20853923 in words is "twenty million, eight hundred fifty-three thousand, nine hundred twenty-three".