20997476 has 12 divisors (see below), whose sum is σ = 36865920. Its totient is φ = 10464360.

The previous prime is 20997467. The next prime is 20997491. The reversal of 20997476 is 67479902.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7196 + ... + 9683.

It is an arithmetic number, because the mean of its divisors is an integer number (3072160).

Almost surely, 2^20997476 is an apocalyptic number.

It is an amenable number.

20997476 is a deficient number, since it is larger than the sum of its proper divisors (15868444).

20997476 is a wasteful number, since it uses less digits than its factorization.

20997476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17194 (or 17192 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 20997476 is about 4582.3002957030. The cubic root of 20997476 is about 275.8813639816.

The spelling of 20997476 in words is "twenty million, nine hundred ninety-seven thousand, four hundred seventy-six".