20997456 has 40 divisors (see below), whose sum is σ = 54621504. Its totient is φ = 6950400.

The previous prime is 20997443. The next prime is 20997461. The reversal of 20997456 is 65479902.

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, 5800 + ... + 8696.

Almost surely, 2^20997456 is an apocalyptic number.

It is an amenable number.

20997456 is an abundant number, since it is smaller than the sum of its proper divisors (33624048).

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

20997456 is a wasteful number, since it uses less digits than its factorization.

20997456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3059 (or 3053 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 20997456 is about 4582.2981133924. The cubic root of 20997456 is about 275.8812763896.

The spelling of 20997456 in words is "twenty million, nine hundred ninety-seven thousand, four hundred fifty-six".