20289608 has 8 divisors (see below), whose sum is σ = 38043030. Its totient is φ = 10144800.

The previous prime is 20289583. The next prime is 20289623. The reversal of 20289608 is 80698202.

It can be written as a sum of positive squares in only one way, i.e., 19518724 + 770884 = 4418^2 + 878^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1268093 + ... + 1268108.

Almost surely, 2^20289608 is an apocalyptic number.

It is an amenable number.

20289608 is a deficient number, since it is larger than the sum of its proper divisors (17753422).

20289608 is a wasteful number, since it uses less digits than its factorization.

20289608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2536207 (or 2536203 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 20289608 is about 4504.3987390106. The cubic root of 20289608 is about 272.7456830939.

The spelling of 20289608 in words is "twenty million, two hundred eighty-nine thousand, six hundred eight".