20972849 has 8 divisors (see below), whose sum is σ = 23172480. Its totient is φ = 18880576.

The previous prime is 20972839. The next prime is 20972851. The reversal of 20972849 is 94827902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20972849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20972839) 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, 26429 + ... + 27210.

It is an arithmetic number, because the mean of its divisors is an integer number (2896560).

Almost surely, 2^20972849 is an apocalyptic number.

It is an amenable number.

20972849 is a deficient number, since it is larger than the sum of its proper divisors (2199631).

20972849 is a wasteful number, since it uses less digits than its factorization.

20972849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53679.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 20972849 is about 4579.6123198367. The cubic root of 20972849 is about 275.7734654853.

The spelling of 20972849 in words is "twenty million, nine hundred seventy-two thousand, eight hundred forty-nine".