20239895 has 16 divisors (see below), whose sum is σ = 26423712. Its totient is φ = 14793600.

The previous prime is 20239859. The next prime is 20239897. The reversal of 20239895 is 59893202.

It is not a de Polignac number, because 20239895 - 2⁶ = 20239831 is a prime.

It is a super-2 number, since 2×20239895² = 819306699222050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20239897) 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 15 ways as a sum of consecutive naturals, for example, 5024 + ... + 8106.

It is an arithmetic number, because the mean of its divisors is an integer number (1651482).

Almost surely, 2^20239895 is an apocalyptic number.

20239895 is a deficient number, since it is larger than the sum of its proper divisors (6183817).

20239895 is a wasteful number, since it uses less digits than its factorization.

20239895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3202.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 20239895 is about 4498.8770821173. The cubic root of 20239895 is about 272.5227431008.

The spelling of 20239895 in words is "twenty million, two hundred thirty-nine thousand, eight hundred ninety-five".