20801265 has 16 divisors (see below), whose sum is σ = 34430400. Its totient is φ = 10711232.

The previous prime is 20801243. The next prime is 20801317. The reversal of 20801265 is 56210802.

It is a cyclic number.

It is not a de Polignac number, because 20801265 - 2¹² = 20797169 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23475 + ... + 24344.

It is an arithmetic number, because the mean of its divisors is an integer number (2151900).

Almost surely, 2^20801265 is an apocalyptic number.

It is an amenable number.

20801265 is a deficient number, since it is larger than the sum of its proper divisors (13629135).

20801265 is a wasteful number, since it uses less digits than its factorization.

20801265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47856.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 20801265 is about 4560.8403830873. The cubic root of 20801265 is about 275.0193485009.

The spelling of 20801265 in words is "twenty million, eight hundred one thousand, two hundred sixty-five".