20881604 has 12 divisors (see below), whose sum is σ = 36768144. Its totient is φ = 10376424.

The previous prime is 20881591. The next prime is 20881613. The reversal of 20881604 is 40618802.

It is a super-2 number, since 2×20881604² = 872082771225632, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15362 + ... + 16665.

It is an arithmetic number, because the mean of its divisors is an integer number (3064012).

Almost surely, 2^20881604 is an apocalyptic number.

It is an amenable number.

20881604 is a deficient number, since it is larger than the sum of its proper divisors (15886540).

20881604 is a wasteful number, since it uses less digits than its factorization.

20881604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32194 (or 32192 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 20881604 is about 4569.6393730797. The cubic root of 20881604 is about 275.3729551265.

The spelling of 20881604 in words is "twenty million, eight hundred eighty-one thousand, six hundred four".