20289577 has 12 divisors (see below), whose sum is σ = 25748496. Its totient is φ = 15809640.

The previous prime is 20289559. The next prime is 20289583. The reversal of 20289577 is 77598202.

It is a de Polignac number, because none of the positive numbers 2^k-20289577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20289527) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 18283 + ... + 19360.

It is an arithmetic number, because the mean of its divisors is an integer number (2145708).

Almost surely, 2^20289577 is an apocalyptic number.

It is an amenable number.

20289577 is a deficient number, since it is larger than the sum of its proper divisors (5458919).

20289577 is a wasteful number, since it uses less digits than its factorization.

20289577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37668 (or 37661 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 20289577 is about 4504.3952979285. The cubic root of 20289577 is about 272.7455441866.

The spelling of 20289577 in words is "twenty million, two hundred eighty-nine thousand, five hundred seventy-seven".