20997496 has 32 divisors (see below), whose sum is σ = 42840000. Its totient is φ = 9590400.

The previous prime is 20997491. The next prime is 20997511. The reversal of 20997496 is 69479902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20997491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9505 + ... + 11503.

It is an arithmetic number, because the mean of its divisors is an integer number (1338750).

Almost surely, 2^20997496 is an apocalyptic number.

20997496 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20997496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21420000).

20997496 is an abundant number, since it is smaller than the sum of its proper divisors (21842504).

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

20997496 is a wasteful number, since it uses less digits than its factorization.

20997496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119 (or 2115 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 20997496 is about 4582.3024780126. The cubic root of 20997496 is about 275.8814515735.

The spelling of 20997496 in words is "twenty million, nine hundred ninety-seven thousand, four hundred ninety-six".