20972411 has 4 divisors (see below), whose sum is σ = 21078000. Its totient is φ = 20866824.

The previous prime is 20972383. The next prime is 20972417. The reversal of 20972411 is 11427902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20972411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20972417) 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, 52496 + ... + 52893.

It is an arithmetic number, because the mean of its divisors is an integer number (5269500).

Almost surely, 2^20972411 is an apocalyptic number.

20972411 is a deficient number, since it is larger than the sum of its proper divisors (105589).

20972411 is a wasteful number, since it uses less digits than its factorization.

20972411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105588.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 20972411 is about 4579.5644989453. The cubic root of 20972411 is about 275.7715457076.

The spelling of 20972411 in words is "twenty million, nine hundred seventy-two thousand, four hundred eleven".