20400895 has 8 divisors (see below), whose sum is σ = 24536304. Its totient is φ = 16283904.

The previous prime is 20400869. The next prime is 20400959. The reversal of 20400895 is 59800402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20400895 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2034 + ... + 6703.

It is an arithmetic number, because the mean of its divisors is an integer number (3067038).

Almost surely, 2^20400895 is an apocalyptic number.

20400895 is a deficient number, since it is larger than the sum of its proper divisors (4135409).

20400895 is an equidigital number, since it uses as much as digits as its factorization.

20400895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9209.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 20400895 is about 4516.7349933331. The cubic root of 20400895 is about 273.2434374546.

The spelling of 20400895 in words is "twenty million, four hundred thousand, eight hundred ninety-five".