20133665 has 8 divisors (see below), whose sum is σ = 24749928. Its totient is φ = 15713920.

The previous prime is 20133649. The next prime is 20133677. The reversal of 20133665 is 56633102.

It can be written as a sum of positive squares in 4 ways, for example, as 277729 + 19855936 = 527^2 + 4456^2 .

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

It is not a de Polignac number, because 20133665 - 2⁴ = 20133649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48902 + ... + 49311.

It is an arithmetic number, because the mean of its divisors is an integer number (3093741).

Almost surely, 2^20133665 is an apocalyptic number.

It is an amenable number.

20133665 is a deficient number, since it is larger than the sum of its proper divisors (4616263).

20133665 is an equidigital number, since it uses as much as digits as its factorization.

20133665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98259.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 20133665 is about 4487.0552704419. The cubic root of 20133665 is about 272.0451238934.

Adding to 20133665 its reverse (56633102), we get a palindrome (76766767).

The spelling of 20133665 in words is "twenty million, one hundred thirty-three thousand, six hundred sixty-five".