20197765 has 16 divisors (see below), whose sum is σ = 28172160. Its totient is φ = 13613760.

The previous prime is 20197763. The next prime is 20197769. The reversal of 20197765 is 56779102.

It is not a de Polignac number, because 20197765 - 2¹ = 20197763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20197763) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2826 + ... + 6955.

It is an arithmetic number, because the mean of its divisors is an integer number (1760760).

Almost surely, 2^20197765 is an apocalyptic number.

It is an amenable number.

20197765 is a deficient number, since it is larger than the sum of its proper divisors (7974395).

20197765 is an equidigital number, since it uses as much as digits as its factorization.

20197765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9852.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 20197765 is about 4494.1923634842. The cubic root of 20197765 is about 272.3335234320. Note that the first 3 decimals are identical.

The spelling of 20197765 in words is "twenty million, one hundred ninety-seven thousand, seven hundred sixty-five".