20601808 has 10 divisors (see below), whose sum is σ = 39916034. Its totient is φ = 10300896.

The previous prime is 20601781. The next prime is 20601817. The reversal of 20601808 is 80810602.

It can be written as a sum of positive squares in only one way, i.e., 13483584 + 7118224 = 3672^2 + 2668^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643791 + ... + 643822.

Almost surely, 2^20601808 is an apocalyptic number.

It is an amenable number.

20601808 is a deficient number, since it is larger than the sum of its proper divisors (19314226).

20601808 is a wasteful number, since it uses less digits than its factorization.

20601808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287621 (or 1287615 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 20601808 is about 4538.9214577915. The cubic root of 20601808 is about 274.1374982545.

The spelling of 20601808 in words is "twenty million, six hundred one thousand, eight hundred eight".