20881330 has 8 divisors (see below), whose sum is σ = 37586412. Its totient is φ = 8352528.

The previous prime is 20881319. The next prime is 20881331. The reversal of 20881330 is 3318802.

It can be written as a sum of positive squares in 2 ways, for example, as 20457529 + 423801 = 4523^2 + 651^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20881295 and 20881304.

It is not an unprimeable number, because it can be changed into a prime (20881331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1044057 + ... + 1044076.

Almost surely, 2^20881330 is an apocalyptic number.

20881330 is a deficient number, since it is larger than the sum of its proper divisors (16705082).

20881330 is a wasteful number, since it uses less digits than its factorization.

20881330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088140.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20881330 is about 4569.6093924973. The cubic root of 20881330 is about 275.3717506768.

The spelling of 20881330 in words is "twenty million, eight hundred eighty-one thousand, three hundred thirty".