20972208 has 30 divisors (see below), whose sum is σ = 54260292. Its totient is φ = 6980160.

The previous prime is 20972179. The next prime is 20972221. The reversal of 20972208 is 80227902.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31398 + ... + 32058.

Almost surely, 2^20972208 is an apocalyptic number.

It is an amenable number.

20972208 is an abundant number, since it is smaller than the sum of its proper divisors (33288084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20972208 is an frugal number, since it uses more digits than its factorization.

20972208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333 (or 666 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20972208 is about 4579.5423352121. The cubic root of 20972208 is about 275.7706559386.

The spelling of 20972208 in words is "twenty million, nine hundred seventy-two thousand, two hundred eight".