20897792 has 28 divisors (see below), whose sum is σ = 41809416. Its totient is φ = 10444800.

The previous prime is 20897761. The next prime is 20897801. The reversal of 20897792 is 29779802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6917 + ... + 9467.

Almost surely, 2^20897792 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20897792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20904708).

20897792 is an abundant number, since it is smaller than the sum of its proper divisors (20911624).

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

20897792 is an frugal number, since it uses more digits than its factorization.

20897792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577 (or 2553 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 20897792 is about 4571.4102856777. The cubic root of 20897792 is about 275.4440956699. Note that the first 3 decimals are identical.

The spelling of 20897792 in words is "twenty million, eight hundred ninety-seven thousand, seven hundred ninety-two".