20161970 has 8 divisors (see below), whose sum is σ = 36291564. Its totient is φ = 8064784.

The previous prime is 20161963. The next prime is 20161987. The reversal of 20161970 is 7916102.

It can be written as a sum of positive squares in 2 ways, for example, as 18601969 + 1560001 = 4313^2 + 1249^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1008089 + ... + 1008108.

Almost surely, 2^20161970 is an apocalyptic number.

20161970 is a deficient number, since it is larger than the sum of its proper divisors (16129594).

20161970 is a wasteful number, since it uses less digits than its factorization.

20161970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2016204.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 20161970 is about 4490.2082357058. The cubic root of 20161970 is about 272.1725494694.

The spelling of 20161970 in words is "twenty million, one hundred sixty-one thousand, nine hundred seventy".