20197795 has 8 divisors (see below), whose sum is σ = 25291296. Its totient is φ = 15455616.

The previous prime is 20197787. The next prime is 20197799. The reversal of 20197795 is 59779102.

20197795 = 640² + 641² + ... + 685².

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

It is a cyclic number.

It is not a de Polignac number, because 20197795 - 2³ = 20197787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20197799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87702 + ... + 87931.

It is an arithmetic number, because the mean of its divisors is an integer number (3161412).

Almost surely, 2^20197795 is an apocalyptic number.

20197795 is a deficient number, since it is larger than the sum of its proper divisors (5093501).

20197795 is a wasteful number, since it uses less digits than its factorization.

20197795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175661.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 20197795 is about 4494.1957011238. The cubic root of 20197795 is about 272.3336582655. Note that the first 3 decimals are identical.

The spelling of 20197795 in words is "twenty million, one hundred ninety-seven thousand, seven hundred ninety-five".