20720896 has 72 divisors (see below), whose sum is σ = 48925184. Its totient is φ = 8570880.

The previous prime is 20720893. The next prime is 20720899. The reversal of 20720896 is 69802702.

It is an interprime number because it is at equal distance from previous prime (20720893) and next prime (20720899).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720893) 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, 55366 + ... + 55738.

Almost surely, 2^20720896 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 20720896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24462592).

20720896 is an abundant number, since it is smaller than the sum of its proper divisors (28204288).

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

20720896 is an equidigital number, since it uses as much as digits as its factorization.

20720896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20720896 is about 4552.0210895821. The cubic root of 20720896 is about 274.6646976744.

The spelling of 20720896 in words is "twenty million, seven hundred twenty thousand, eight hundred ninety-six".