20975956 has 12 divisors (see below), whose sum is σ = 37225440. Its totient is φ = 10340120.

The previous prime is 20975939. The next prime is 20975971. The reversal of 20975956 is 65957902.

It is a happy number.

It is a super-3 number, since 3×20975956³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36646 + ... + 37213.

It is an arithmetic number, because the mean of its divisors is an integer number (3102120).

Almost surely, 2^20975956 is an apocalyptic number.

It is an amenable number.

20975956 is a deficient number, since it is larger than the sum of its proper divisors (16249484).

20975956 is a wasteful number, since it uses less digits than its factorization.

20975956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73934 (or 73932 counting only the distinct ones).

The product of its (nonzero) digits is 170100, while the sum is 43.

The square root of 20975956 is about 4579.9515281278. The cubic root of 20975956 is about 275.7870828666.

The spelling of 20975956 in words is "twenty million, nine hundred seventy-five thousand, nine hundred fifty-six".