20997376 has 18 divisors (see below), whose sum is σ = 41913242. Its totient is φ = 10498560.

The previous prime is 20997349. The next prime is 20997377. The reversal of 20997376 is 67379902.

It can be written as a sum of positive squares in only one way, i.e., 20939776 + 57600 = 4576^2 + 240^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20997377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40755 + ... + 41266.

Almost surely, 2^20997376 is an apocalyptic number.

It is an amenable number.

20997376 is a deficient number, since it is larger than the sum of its proper divisors (20915866).

20997376 is an frugal number, since it uses more digits than its factorization.

20997376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82037 (or 82023 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 43.

The square root of 20997376 is about 4582.2893841398. The cubic root of 20997376 is about 275.8809260213.

The spelling of 20997376 in words is "twenty million, nine hundred ninety-seven thousand, three hundred seventy-six".