20839995 has 24 divisors (see below), whose sum is σ = 39407472. Its totient is φ = 10104000.

The previous prime is 20839969. The next prime is 20839997. The reversal of 20839995 is 59993802.

It is not a de Polignac number, because 20839995 - 2⁷ = 20839867 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20839995.

It is not an unprimeable number, because it can be changed into a prime (20839997) 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, 20556 + ... + 21545.

It is an arithmetic number, because the mean of its divisors is an integer number (1641978).

Almost surely, 2^20839995 is an apocalyptic number.

20839995 is a deficient number, since it is larger than the sum of its proper divisors (18567477).

20839995 is a wasteful number, since it uses less digits than its factorization.

20839995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42123 (or 42120 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 20839995 is about 4565.0843365704. The cubic root of 20839995 is about 275.1899294007.

The spelling of 20839995 in words is "twenty million, eight hundred thirty-nine thousand, nine hundred ninety-five".