20801275 has 12 divisors (see below), whose sum is σ = 28138824. Its totient is φ = 15128000.

The previous prime is 20801243. The next prime is 20801317. The reversal of 20801275 is 57210802.

It is not a de Polignac number, because 20801275 - 2⁵ = 20801243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37546 + ... + 38095.

It is an arithmetic number, because the mean of its divisors is an integer number (2344902).

Almost surely, 2^20801275 is an apocalyptic number.

20801275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20801275 is a deficient number, since it is larger than the sum of its proper divisors (7337549).

20801275 is a wasteful number, since it uses less digits than its factorization.

20801275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75662 (or 75657 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 20801275 is about 4560.8414793764. The cubic root of 20801275 is about 275.0193925718.

It can be divided in two parts, 20801 and 275, that multiplied together give a palindrome (5720275).

The spelling of 20801275 in words is "twenty million, eight hundred one thousand, two hundred seventy-five".