20896740 has 72 divisors (see below), whose sum is σ = 67125240. Its totient is φ = 5243904.

The previous prime is 20896721. The next prime is 20896741. The reversal of 20896740 is 4769802.

It can be written as a sum of positive squares in 4 ways, for example, as 4639716 + 16257024 = 2154^2 + 4032^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20896695 and 20896704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20896741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 355 + ... + 6474.

It is an arithmetic number, because the mean of its divisors is an integer number (932295).

Almost surely, 2^20896740 is an apocalyptic number.

20896740 is a gapful number since it is divisible by the number (20) 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 20896740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33562620).

20896740 is an abundant number, since it is smaller than the sum of its proper divisors (46228500).

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

20896740 is a wasteful number, since it uses less digits than its factorization.

20896740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6861 (or 6856 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20896740 is about 4571.2952212694. The cubic root of 20896740 is about 275.4394736178.

The spelling of 20896740 in words is "twenty million, eight hundred ninety-six thousand, seven hundred forty".