20289512 has 8 divisors (see below), whose sum is σ = 38042850. Its totient is φ = 10144752.

The previous prime is 20289509. The next prime is 20289523. The reversal of 20289512 is 21598202.

It can be written as a sum of positive squares in only one way, i.e., 13498276 + 6791236 = 3674^2 + 2606^2 .

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, 1268087 + ... + 1268102.

Almost surely, 2^20289512 is an apocalyptic number.

It is an amenable number.

20289512 is a deficient number, since it is larger than the sum of its proper divisors (17753338).

20289512 is a wasteful number, since it uses less digits than its factorization.

20289512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2536195 (or 2536191 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 20289512 is about 4504.3880827478. The cubic root of 20289512 is about 272.7452529291.

The spelling of 20289512 in words is "twenty million, two hundred eighty-nine thousand, five hundred twelve".