20972707 has 8 divisors (see below), whose sum is σ = 24152832. Its totient is φ = 17838600.

The previous prime is 20972663. The next prime is 20972729. The reversal of 20972707 is 70727902.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20972707 - 2⁷ = 20972579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20972797) 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 7 ways as a sum of consecutive naturals, for example, 10519 + ... + 12352.

It is an arithmetic number, because the mean of its divisors is an integer number (3019104).

Almost surely, 2^20972707 is an apocalyptic number.

20972707 is a deficient number, since it is larger than the sum of its proper divisors (3180125).

20972707 is a wasteful number, since it uses less digits than its factorization.

20972707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23009.

The product of its (nonzero) digits is 12348, while the sum is 34.

The square root of 20972707 is about 4579.5968163147. The cubic root of 20972707 is about 275.7728430945.

The spelling of 20972707 in words is "twenty million, nine hundred seventy-two thousand, seven hundred seven".