20972207 has 4 divisors (see below), whose sum is σ = 21022680. Its totient is φ = 20921736.

The previous prime is 20972179. The next prime is 20972221. The reversal of 20972207 is 70227902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70227902 = 2 ⋅35113951.

It is a cyclic number.

It is not a de Polignac number, because 20972207 - 2²² = 16777903 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 20972207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20972267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24608 + ... + 25445.

It is an arithmetic number, because the mean of its divisors is an integer number (5255670).

Almost surely, 2^20972207 is an apocalyptic number.

20972207 is a deficient number, since it is larger than the sum of its proper divisors (50473).

20972207 is an equidigital number, since it uses as much as digits as its factorization.

20972207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50472.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 20972207 is about 4579.5422260309. The cubic root of 20972207 is about 275.7706515555.

The spelling of 20972207 in words is "twenty million, nine hundred seventy-two thousand, two hundred seven".