20853719 has 2 divisors, whose sum is σ = 20853720. Its totient is φ = 20853718.

The previous prime is 20853673. The next prime is 20853757. The reversal of 20853719 is 91735802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20853719 - 2²⁰ = 19805143 is a prime.

It is a super-2 number, since 2×20853719² = 869755192261922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20853799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10426859 + 10426860.

It is an arithmetic number, because the mean of its divisors is an integer number (10426860).

Almost surely, 2^20853719 is an apocalyptic number.

20853719 is a deficient number, since it is larger than the sum of its proper divisors (1).

20853719 is an equidigital number, since it uses as much as digits as its factorization.

20853719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 20853719 is about 4566.5872377521. The cubic root of 20853719 is about 275.2503241345.

The spelling of 20853719 in words is "twenty million, eight hundred fifty-three thousand, seven hundred nineteen".