20875961 has 4 divisors (see below), whose sum is σ = 20902032. Its totient is φ = 20849892.

The previous prime is 20875931. The next prime is 20875963. The reversal of 20875961 is 16957802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20875961 - 2¹⁰ = 20874937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20875963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11795 + ... + 13448.

It is an arithmetic number, because the mean of its divisors is an integer number (5225508).

Almost surely, 2^20875961 is an apocalyptic number.

It is an amenable number.

20875961 is a deficient number, since it is larger than the sum of its proper divisors (26071).

20875961 is an equidigital number, since it uses as much as digits as its factorization.

20875961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26070.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 20875961 is about 4569.0218865748. The cubic root of 20875961 is about 275.3481474922.

The spelling of 20875961 in words is "twenty million, eight hundred seventy-five thousand, nine hundred sixty-one".