20970671 has 4 divisors (see below), whose sum is σ = 21030432. Its totient is φ = 20910912.

The previous prime is 20970667. The next prime is 20970679. The reversal of 20970671 is 17607902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20970671 - 2² = 20970667 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20970679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29351 + ... + 30056.

It is an arithmetic number, because the mean of its divisors is an integer number (5257608).

Almost surely, 2^20970671 is an apocalyptic number.

20970671 is a deficient number, since it is larger than the sum of its proper divisors (59761).

20970671 is an equidigital number, since it uses as much as digits as its factorization.

20970671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59760.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 20970671 is about 4579.3745206087. The cubic root of 20970671 is about 275.7639189298.

The spelling of 20970671 in words is "twenty million, nine hundred seventy thousand, six hundred seventy-one".