20972285 has 8 divisors (see below), whose sum is σ = 25249536. Its totient is φ = 16722640.

The previous prime is 20972269. The next prime is 20972291. The reversal of 20972285 is 58227902.

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

It is not a de Polignac number, because 20972285 - 2⁴ = 20972269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5189 + ... + 8298.

It is an arithmetic number, because the mean of its divisors is an integer number (3156192).

Almost surely, 2^20972285 is an apocalyptic number.

It is an amenable number.

20972285 is a deficient number, since it is larger than the sum of its proper divisors (4277251).

20972285 is a wasteful number, since it uses less digits than its factorization.

20972285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13803.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 20972285 is about 4579.5507421580. The cubic root of 20972285 is about 275.7709934379.

The spelling of 20972285 in words is "twenty million, nine hundred seventy-two thousand, two hundred eighty-five".