20953970 has 8 divisors (see below), whose sum is σ = 37717164. Its totient is φ = 8381584.

The previous prime is 20953969. The next prime is 20953973. The reversal of 20953970 is 7935902.

It can be written as a sum of positive squares in 2 ways, for example, as 20948929 + 5041 = 4577^2 + 71^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20953970.

It is not an unprimeable number, because it can be changed into a prime (20953973) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1047689 + ... + 1047708.

Almost surely, 2^20953970 is an apocalyptic number.

20953970 is a deficient number, since it is larger than the sum of its proper divisors (16763194).

20953970 is a wasteful number, since it uses less digits than its factorization.

20953970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2095404.

The product of its (nonzero) digits is 17010, while the sum is 35.

The square root of 20953970 is about 4577.5506550993. The cubic root of 20953970 is about 275.6906935449.

The spelling of 20953970 in words is "twenty million, nine hundred fifty-three thousand, nine hundred seventy".