20870312 has 16 divisors (see below), whose sum is σ = 40086900. Its totient is φ = 10180480.

The previous prime is 20870293. The next prime is 20870321. The reversal of 20870312 is 21307802.

It can be written as a sum of positive squares in 2 ways, for example, as 18541636 + 2328676 = 4306^2 + 1526^2 .

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, 31487 + ... + 32142.

Almost surely, 2^20870312 is an apocalyptic number.

It is an amenable number.

20870312 is a deficient number, since it is larger than the sum of its proper divisors (19216588).

20870312 is a wasteful number, since it uses less digits than its factorization.

20870312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63676 (or 63672 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20870312 is about 4568.4036599232. The cubic root of 20870312 is about 275.3233090028.

The spelling of 20870312 in words is "twenty million, eight hundred seventy thousand, three hundred twelve".