20972230 has 8 divisors (see below), whose sum is σ = 37750032. Its totient is φ = 8388888.

The previous prime is 20972221. The next prime is 20972233. The reversal of 20972230 is 3227902.

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

It is a junction number, because it is equal to n+sod(n) for n = 20972195 and 20972204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20972233) 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 3 ways as a sum of consecutive naturals, for example, 1048602 + ... + 1048621.

It is an arithmetic number, because the mean of its divisors is an integer number (4718754).

Almost surely, 2^20972230 is an apocalyptic number.

20972230 is a deficient number, since it is larger than the sum of its proper divisors (16777802).

20972230 is a wasteful number, since it uses less digits than its factorization.

20972230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097230.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 20972230 is about 4579.5447371982. The cubic root of 20972230 is about 275.7707523671.

The spelling of 20972230 in words is "twenty million, nine hundred seventy-two thousand, two hundred thirty".