20975970 has 32 divisors (see below), whose sum is σ = 50466240. Its totient is φ = 5579840.

The previous prime is 20975939. The next prime is 20975971. The reversal of 20975970 is 7957902.

It is not an unprimeable number, because it can be changed into a prime (20975971) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 19240 + ... + 20300.

It is an arithmetic number, because the mean of its divisors is an integer number (1577070).

Almost surely, 2^20975970 is an apocalyptic number.

20975970 is an abundant number, since it is smaller than the sum of its proper divisors (29490270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20975970 is a wasteful number, since it uses less digits than its factorization.

20975970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730.

The product of its (nonzero) digits is 39690, while the sum is 39.

The square root of 20975970 is about 4579.9530565280. The cubic root of 20975970 is about 275.7871442229.

It can be divided in two parts, 20975 and 970, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 20975970 in words is "twenty million, nine hundred seventy-five thousand, nine hundred seventy".