20800975 has 24 divisors (see below), whose sum is σ = 28748160. Its totient is φ = 14824320.

The previous prime is 20800973. The next prime is 20800987. The reversal of 20800975 is 57900802.

It is not a de Polignac number, because 20800975 - 2¹ = 20800973 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20800973) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8322 + ... + 10528.

It is an arithmetic number, because the mean of its divisors is an integer number (1197840).

Almost surely, 2^20800975 is an apocalyptic number.

20800975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20800975 is a deficient number, since it is larger than the sum of its proper divisors (7947185).

20800975 is a wasteful number, since it uses less digits than its factorization.

20800975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2259 (or 2254 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 20800975 is about 4560.8085905901. The cubic root of 20800975 is about 275.0180704379.

The spelling of 20800975 in words is "twenty million, eight hundred thousand, nine hundred seventy-five".