20636995 has 16 divisors (see below), whose sum is σ = 25515648. Its totient is φ = 16015360.

The previous prime is 20636953. The next prime is 20637011. The reversal of 20636995 is 59963602.

It is not a de Polignac number, because 20636995 - 2⁷ = 20636867 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 31875 + ... + 32515.

It is an arithmetic number, because the mean of its divisors is an integer number (1594728).

Almost surely, 2^20636995 is an apocalyptic number.

20636995 is a deficient number, since it is larger than the sum of its proper divisors (4878653).

20636995 is a wasteful number, since it uses less digits than its factorization.

20636995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830.

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 20636995 is about 4542.7959452302. The cubic root of 20636995 is about 274.2934811608.

The spelling of 20636995 in words is "twenty million, six hundred thirty-six thousand, nine hundred ninety-five".