20121265 has 8 divisors (see below), whose sum is σ = 24171840. Its totient is φ = 16079472.

The previous prime is 20121193. The next prime is 20121271. The reversal of 20121265 is 56212102.

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 20121265 - 2⁷ = 20121137 is a prime.

It is an unprimeable number.

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, 4996 + ... + 8074.

It is an arithmetic number, because the mean of its divisors is an integer number (3021480).

Almost surely, 2^20121265 is an apocalyptic number.

It is an amenable number.

20121265 is a deficient number, since it is larger than the sum of its proper divisors (4050575).

20121265 is a wasteful number, since it uses less digits than its factorization.

20121265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4391.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20121265 is about 4485.6733050903. The cubic root of 20121265 is about 271.9892630205.

Adding to 20121265 its reverse (56212102), we get a palindrome (76333367).

The spelling of 20121265 in words is "twenty million, one hundred twenty-one thousand, two hundred sixty-five".